Document:

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                                                                  EXHIBIT 10.21

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This Warrant and the Common Stock issuable upon exercise hereof have not been
registered or qualified for sale under the Securities Act of 1933, as amended,
or any State securities law and may not be sold or transferred in the absence of
such registration or qualification or an exemption therefrom under said Act and
any such State laws which may be applicable and are transferable only upon the
conditions specified in this Warrant.

No. WR-
       -------
                                                                 [     ] Shares
                                                                  -----

                               WARRANT TO PURCHASE

                             SHARES OF COMMON STOCK

                                       OF

                          AMERICAN HOMESTAR CORPORATION

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                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
SECTION                                       HEADING                                                      PAGE
<S>     <C>           <C>                                                                                  <C>
SECTION 1.            EXERCISE OF WARRANT....................................................................2

SECTION 2.            RESERVATION............................................................................3

SECTION 3.            PROTECTION AGAINST DILUTION............................................................3

       Section 3.1.   Stock Dividends, Subdivisions and Combinations.........................................3
       Section 3.2    Issuance of Additional Shares of Common Stock..........................................4
       Section 3.3.   Issuance of Warrants or Other Rights, Convertible Securities...........................5
       Section 3.4.   Other Provisions Applicable to Adjustments Under this Section..........................6
       Section 3.5.   Dividends..............................................................................7
       Section 3.6.   Adjustment of Number of Shares Purchasable.............................................7
       Section 3.7.   Minimum Adjustment.....................................................................7
       Section 3.8.   Notice of Adjustments; Adjustment of Warrants..........................................7

SECTION 4.            MERGERS, CONSOLIDATIONS, SALES.........................................................8

SECTION 5.            DISSOLUTION OR LIQUIDATION.............................................................8

SECTION 6.            NOTICE OF EXTRAORDINARY DIVIDENDS......................................................8

SECTION 7.            FRACTIONAL SHARES......................................................................9

SECTION 8.            FULLY PAID STOCK; TAXES................................................................9

SECTION 9.            CLOSING OF TRANSFER BOOKS..............................................................9

SECTION 10.           RESTRICTIONS ON TRANSFERABILITY OF WARRANTS AND SHARES; COMPLIANCE WITH
                      LAWS...................................................................................9

       Section 10.1.  In General.............................................................................9
       Section 10.2.  Restrictive Legends...................................................................10
       Section 10.3.  Notice of Proposed Transfer; Registration Not Required................................10
       Section 10.4.  Required Registration and Notice......................................................11
       Section 10.5.  Conditions to Required Registration...................................................12
       Section 10.6.  Incidental Registration...............................................................13
       Section 10.7.  Expenses..............................................................................14
       Section 10.8.  Indemnification.......................................................................14
</TABLE>

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<TABLE>
<S>     <C>           <C>                                                                                  <C>
       Section 10.9.  Contribution..........................................................................15

SECTION 11.           PARTIAL ASSIGNMENT....................................................................15

SECTION 12.           WARRANT DENOMINATIONS.................................................................16

SECTION 13.           REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE COMPANY..............................16

       Section 13.1.  Organization; Power and Authority.....................................................16
       Section 13.2.  Authorization, etc....................................................................16
       Section 13.3.  Organization and Ownership of Shares of Subsidiaries..................................16
       Section 13.4.  Compliance with Laws, Other Instruments, etc..........................................17
       Section 13.5.  Governmental Authorizations, etc......................................................17
       Section 13.6.  Private Offering by the Company.......................................................17
       Section 13.7.  Limitations on Amendment to Articles of Incorporation.................................17
       Section 13.8.  No Impairment.........................................................................17
       Section 13.9.  Indemnification.......................................................................18
       Section 13.10. Requested Information.................................................................18

SECTION 14.           DEFINITIONS...........................................................................18

SECTION 15.           LOST, STOLEN WARRANTS, ETC............................................................21

SECTION 16.           WARRANT HOLDER NOT SHAREHOLDER........................................................21

SECTION 17.           SEVERABILITY..........................................................................21

SECTION 18.           INDEX AND CAPTIONS....................................................................21

SECTION 19.           REPRESENTATION OF HOLDER..............................................................21

Signatures..................................................................................................22
</TABLE>

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This Warrant and the Common Stock issuable upon exercise hereof have not been
registered or qualified for sale under the Securities Act of 1933, as amended,
or any State securities law and may not be sold or transferred in the absence of
such registration or qualification or an exemption therefrom under said Act and
any such State laws which may be applicable.

No. WR-
       ------

                                                                [     ] Shares
                                                                 -----

                               WARRANT TO PURCHASE

                             SHARES OF COMMON STOCK

                                       OF

                          AMERICAN HOMESTAR CORPORATION

         THIS IS TO CERTIFY that, for value received and subject to the
provisions hereinafter set forth,

                                    [HOLDER]

                                   or assigns,

is entitled to purchase from American Homestar Corporation, a Texas corporation
(the "Company"), at any time on or after the first to occur of (i) a Permitted
Exercise Event or (ii) January 2, 2005 and before 5:00 P.M. September 30, 2008
(such date (beginning at 5:00 P.M. Chicago time) being herein referred to as the
"Expiration Date"), __________ shares of Common Stock, $0.05 par value, of the
Company, all on and subject to the terms, provisions and conditions hereinafter
set forth, at a price equal to the Initial per share Warrant Price. The initial
number of shares of Common Stock of the Company purchasable hereunder is
[____________].

         The aggregate price of the Common Stock shall be equal to the Initial
per Share Warrant Price multiplied by the number of shares initially purchasable
hereunder (as increased by the third to the last paragraph of Section 1). The
aggregate price is herein sometimes referred to as the "Aggregate Warrant Price"
and is not subject to adjustment (except as set forth above). The Initial per
share Warrant Price is, however, subject to adjustment as hereinafter provided
(the Initial per share Warrant Price, or such price as last adjusted, as the
case may be, being herein referred to as the "per share Warrant Price"). The
said number of shares purchasable hereunder is likewise subject to adjustment as
hereinafter provided.

         The terms which are capitalized herein shall have the meanings
specified in Section 14 unless the context shall otherwise require.

<PAGE>   5

SECTION 1. EXERCISE OF WARRANT.

         Subject to the conditions hereinafter set forth, this Warrant may be
exercised in whole or in part, at any time on or after the first to occur of (i)
a Permitted Exercise Event or (ii) January 2, 2005 but in no event subsequent to
the Expiration Date, by the surrender of this Warrant (with the subscription
form at the end hereof duly completed and executed) at the principal office of
the Company at 2450 South Share Boulevard, Suite 300, League City, Texas 77573
and upon payment to the Company of the Aggregate Warrant Price (or, if exercised
in part, upon payment to the Company of a proportionate part of the Aggregate
Warrant Price) for the shares so purchased. At the option of the holder hereof,
payment of the Aggregate Warrant Price (or proportionate amount thereof) shall
be made (w) by wire transfer of funds to an account in a bank located in the
United States designated by the Company for such purpose, (x) by check payable
to the order of the Company, (y) by application of any Common Stock or any
Notes, as provided below, or (z) by any combination of such methods.

         Upon the exercise of this Warrant in whole or in part, the holder
hereof may, at its option, submit to the Company written instructions from such
holder to apply any specified portion of the Common Stock issuable upon such
exercise in payment of the Aggregate Warrant Price required upon such exercise,
in which case the Company will accept such specified portion of the Common Stock
(at a value per share equal to the Current Market Price of such share), less, in
each case, the Aggregate Warrant Price (or proportionate amount thereof) then in
effect, in lieu of a like amount of such cash payment.

         Upon the exercise of this Warrant in whole or in part by the holder of
any Notes, such holder may, at its option, surrender such Notes to the Company
together with written instructions from such holder to apply all or any
specified principal amount of such Notes against the payment of some or all of
the Aggregate Warrant Price required upon such exercise, in which case the
Company will accept such specified principal amount in lieu of a like amount of
cash. In lieu of or in addition to the aforesaid application, such holder may,
without surrendering such Notes, furnish the Company with written instructions
to apply all or any specified amount of accrued interest on such Notes against
the payment of some or all of the Aggregate Warrant Price required upon such
exercise, in which case the Company will accept such specified accrued interest
in lieu of a like amount of cash. Upon any such partial application of the
principal of any such Note, the Company at its expense will promptly issue and
deliver to or upon the order of the holder thereof a new Note or Notes equal in
aggregate principal amount to the unpaid principal amount of such surrendered
Note not so applied and dated so as to result in no loss of interest. Subject to
the second preceding sentence, at the time of surrender of any such Note
pursuant to this Section 1, the Company will pay to the holder surrendering such
Note all interest on the principal amount thereof so applied accrued to and
including the date of such surrender.

         If this Warrant is exercised in respect of less than all of the shares
of said Common Stock at the time purchasable hereunder, the holder hereof shall
be entitled to receive a new Warrant covering the number of shares in respect of
which this Warrant shall not have been exercised and setting forth the
proportionate amount of the Aggregate Warrant Price applicable to such shares.

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         Notwithstanding anything contained in this Warrant to the contrary, in
the event that the Company at any time and from time to time issues any shares
of Common Stock of the Company pursuant to either (i) any Special Stock Plan or
(ii) any conversion of the Series A Convertible Preferred Stock of the Company,
the Company will give immediate written notice thereof to the holder hereof of
such issuance, describing in reasonable detail the number of shares of Common
Stock then being issued. Such notice shall also contain the written confirmation
by the Company that the aggregate number of shares into which this Warrant is
then exercisable shall be increased by an amount equal to 10% of the shares of
Common Stock then being issued pursuant to any such Special Stock Plan or the
Series A Convertible Preferred Stock of the Company. Regardless of whether the
Company satisfies its obligation herein to give such notice, the holder hereof
shall be entitled to exercise this Warrant into such greater number of shares at
all times from and after any and all such issuances of such Common Stock, from
time to time. At any time from and after the date of any such issuance of Common
Stock, and from time to time thereafter, the holder hereof shall be entitled to
replace this Warrant with a new Warrant evidencing the increased number of
shares into which this Warrant is then exercisable. It is specifically
understood that the foregoing provisions of this paragraph shall apply to any
and all issuances of Common Stock, from time to time, pursuant to either of the
Special Stock Plans or the Series A Convertible Preferred Stock at any time
prior to the Expiration Date hereof.

         The right to exercise this Warrant shall expire on the Expiration Date
and shall be wholly null and void to the extent this Warrant is not exercised
before it expires.

         The Company shall pay all reasonable expenses, taxes and other charges
payable in connection with the preparation, execution and delivery of stock
certificates pursuant to this Section, regardless of the name or names in which
such stock certificates shall be registered (excluding transfer taxes if the
stock certificate is being registered in the name of a holder other than the
holder of the Warrant).

SECTION 2. RESERVATION.

         The Company will at all times prior to the Expiration Date reserve and
keep available such number of authorized shares of its Common Stock, solely for
the purpose of issue upon the exercise of the rights represented by this Warrant
as herein provided for, as may at any time be issuable upon the exercise of this
Warrant and such shares issuable upon the exercise of this Warrant shall at no
time have a par value which is in excess of the per share Warrant Price.

SECTION 3. PROTECTION AGAINST DILUTION.

         The per share Warrant Price and the number of shares deliverable
hereunder shall be adjusted (without duplication) as hereinafter set forth:

         Section 3.1. Stock Dividends, Subdivisions and Combinations. In the
event that after the date hereof the Company shall:

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                  (a) take a record of the holders of its Common Stock for the
         purpose of entitling them to receive a dividend payable in, or other
         distribution of, Common Stock, or

                  (b) subdivide its outstanding shares of Common Stock into a
         larger number of shares of Common Stock, or

                  (c) combine its outstanding shares of Common Stock into a
         smaller number of shares of Common Stock,

then the per share Warrant Price shall be adjusted to that price determined by
multiplying the per share Warrant Price in effect immediately prior to such
event by a fraction (i) the numerator of which shall be the total number of
outstanding shares of Common Stock of the Company immediately prior to such
event, and (ii) the denominator of which shall be the total number of
outstanding shares of Common Stock of the Company immediately after such event.
Appropriate readjustment of the per share Warrant Price shall be made in the
event that any dividend or distribution referred to above in clause (a) shall be
lawfully abandoned.

         Section 3.2. Issuance of Additional Shares of Common Stock. In case
after the date hereof the Company shall issue any Additional Shares of Common
Stock for a consideration (i) less than the then effective per share Warrant
Price or (ii) less than the Current Market Price per share, then the per share
Warrant Price upon each such issuance shall be adjusted to that price determined
by multiplying the per share Warrant Price in effect immediately prior to such
event by a fraction:

                  (a) if issued for a consideration per share less than the then
         effective per share Warrant Price:

                           (1) the numerator of which shall be the number of
                  shares of Common Stock outstanding immediately prior to the
                  issuance of such Additional Shares of Common Stock plus the
                  number of full shares of Common Stock which the aggregate
                  consideration for the total number of such Additional Shares
                  of Common Stock so issued would purchase at the then effective
                  per share Warrant Price, and

                           (2) the denominator of which shall be the number of
                  shares of Common Stock outstanding immediately prior to the
                  issuance of such Additional Shares of Common Stock plus the
                  number of such Additional Shares of Common Stock so issued.

                  (b) if issued for a consideration per share less than the
         Current Market Price per share of Common Stock:

                           (1) the numerator of which shall be the number of
                  shares of Common Stock outstanding immediately prior to the
                  issuance of such Additional Shares of Common Stock plus the
                  number of full shares of Common Stock which the

                                      -4-
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                  aggregate consideration for the total number of such
                  Additional Shares of Common Stock so issued would purchase at
                  the Current Market Price per share, and

                           (2) the denominator of which shall be the number of
                  shares of Common Stock outstanding immediately prior to the
                  issuance of such Additional Shares of Common Stock plus the
                  number of such Additional Shares of Common Stock so issued.

                  If such Additional Shares of Common Stock shall be issued at a
         price per share less than both the then effective per share Warrant
         Price and the Current Market Price per share of Common Stock, the per
         share Warrant Price shall be adjusted in the manner (i.e., pursuant to
         paragraph (a) or (b) above) which will result in the greatest reduction
         of the per share Warrant Price. The provisions of this subparagraph
         shall not apply to any Additional Shares of Common Stock which are
         distributed to holders of Common Stock as a stock dividend or
         subdivision, for which an adjustment is provided for under Section 3.1.
         No adjustment of the per share Warrant Price shall be made under this
         Section 3.2 upon the issuance of any Additional Shares of Common Stock
         which are issued pursuant to the exercise of any warrants or other
         subscription or purchase rights or pursuant to the exercise of any
         conversion or exchange rights in any Convertible Securities, to the
         extent any such adjustment shall previously have been made upon the
         issuance of such warrants or other rights or upon the issuance of such
         Convertible Securities (or upon the issuance of any warrants or other
         rights therefor) pursuant to Section 3.3.

         Section 3.3. Issuance of Warrants or Other Rights, Convertible
Securities. In case the Company shall issue any Convertible Securities and the
consideration per share for which Additional Shares of Common Stock may at any
time thereafter be issuable pursuant to the terms of such Convertible Securities
shall be less than either (i) the effective per share Warrant Price at the time
of issuance of such warrants, rights or Convertible Securities or (ii) the
Current Market Price per share, then the per share Warrant Price shall be
adjusted as provided in Section 3.2 above on the basis that:

                   (a) the maximum number of Additional Shares of Common Stock
         issuable pursuant to all such Convertible Securities shall be deemed to
         have been issued as of the earlier of (i) the date on which the Company
         shall enter a firm contract or commitment for the issuance of such
         Convertible Securities or (ii) the date of actual issuance of such
         Convertible Securities, and

                   (b) the aggregate consideration for such maximum number of
         Additional Shares of Common Stock shall be deemed to be the minimum
         consideration received and receivable by the Company for the issuance
         of such Additional Shares of Common Stock pursuant to such Convertible
         Securities.

         No adjustment of the per share Warrant Price shall be made under this
Section 3.3 upon the issuance of any Convertible Securities which are issued
pursuant to the exercise of any warrants or other subscription or purchase or
conversion or exchange rights therefor, to the extent

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<PAGE>   9

that any such adjustment shall previously have been made upon the issuance of
such warrants or other rights pursuant to this Section 3.3.

         Section 3.4. Other Provisions Applicable to Adjustments under This
Section. The following provisions shall be applicable to the making of
adjustments in the per share Warrant Price hereinbefore provided in this Section
3:

                  (a) Computation of Consideration. To the extent that any
         Additional Shares of Common Stock or any Convertible Securities shall
         be issued for a cash consideration, the consideration received by the
         Company therefor shall be deemed to be the amount of the cash received
         by the Company therefor, or, if such Additional Shares of Common Stock
         or Convertible Securities are offered by the Company for subscription,
         the subscription price, or, if such Additional Shares of Common Stock
         or Convertible Securities are sold to underwriters or dealers for
         public offering without a subscription offering, the initial public
         offering price, in any such case excluding any amounts paid or
         receivable for accrued interest or accrued dividends and without
         deduction of any compensation, discounts or expenses paid or incurred
         by the Company for and in the underwriting thereof, or otherwise in
         connection with the issue thereof. To the extent that such issuance
         shall be for a consideration other than cash, then, except as herein
         otherwise expressly provided, the amount of such consideration shall be
         deemed to be the fair value of such consideration at the time of such
         issuance as determined in good faith by the Board of Directors of the
         Company. The consideration for any Additional Shares of Common Stock
         issuable pursuant to the terms of any Convertible Securities shall be
         the consideration received by the Company for issuing such Convertible
         Securities plus the consideration paid or payable to the Company in
         respect of the subscription for or purchase of such Convertible
         Securities plus the additional consideration, if any, payable to the
         Company upon the exercise of the right of conversion, exchange or
         exercise of such Convertible Securities. In case of the issuance at any
         time of any Additional Shares of Common Stock or Convertible Securities
         in payment or satisfaction of any dividend upon any class of equity
         securities other than Common Stock, the Company shall be deemed to have
         received for such Additional Shares of Common Stock or Convertible
         Securities a consideration equal to the amount of such dividend so paid
         or satisfied.

                  (b) Readjustment of per share Warrant Price. Upon expiration
         of the right of conversion, exchange or exercise of any Convertible
         Securities, or upon any increase in the minimum consideration
         receivable by the Company for the issuance of Additional Shares of
         Common Stock pursuant to such Convertible Securities, if any such
         Convertible Securities shall not have been converted, exchanged or
         exercised, the number of shares of Common Stock deemed to be issued and
         outstanding by reason of the fact that they were issuable upon
         conversion, exchange or exercise of any such Convertible Securities
         shall no longer be computed as set forth above, and the per share
         Warrant Price shall forthwith be readjusted and thereafter be the price
         which it would have been (but reflecting any other adjustments in the
         per share Warrant Price made pursuant to the provisions of this Section
         3 after the issuance of such Convertible Securities) had the adjustment
         of the per share Warrant Price made upon the issuance or sale of such
         Convertible Securities been made on the basis of the issuance only of
         the number of

                                      -6-

<PAGE>   10

         Additional Shares of Common Stock actually issued upon conversion,
         exchange or exercise of such Convertible Securities or upon the basis
         of such increased minimum consideration, as the case may be, and
         thereupon only the number of Additional Shares of Common Stock actually
         so issued or the number thereof issuable upon the basis of such
         increased minimum consideration shall be deemed to have been issued and
         only the consideration actually received or such increased minimum
         consideration receivable by the Company (computed in accordance with
         Section 3.4(a)) shall be deemed to have been received by the Company.

         Section 3.5. Dividends. In case the Company shall declare a dividend
upon its Common Stock (except a dividend payable in shares of Common Stock
referred to in Section 3.1(a) or Convertible Securities referred to in Section
3.3), the per share Warrant Price in effect immediately prior to the declaration
of such dividend shall be reduced by multiplying such per share Warrant Price by
a fraction, the numerator of which is equal to the consolidated assets of the
Company immediately after giving effect to such dividend and the denominator of
which is equal to the consolidated assets of the Company immediately preceding
the payment of such dividend.

         Section 3.6. Adjustment of Number of Shares Purchasable. Upon each
adjustment of the per share Warrant Price, the number of shares of Common Stock
purchasable hereunder shall be adjusted so that the number of shares purchasable
hereunder shall be equal to the applicable Aggregate Warrant Price divided by
the per share Warrant Price in effect immediately following such adjustment.

         Section 3.7. Minimum Adjustment. Except as hereinafter provided, no
adjustment of the per share Warrant Price hereunder shall be made if such
adjustment results in a change of the per share Warrant Price then in effect of
less than 1.00%. Any adjustment of less than 1.00% shall be carried forward and
shall be made at the time of and together with any subsequent adjustment which,
together with the adjustment or adjustments so carried forward, amounts to 1.00%
or more of the per share Warrant Price then in effect. However, upon the
exercise of this Warrant, the Company shall make all necessary adjustments not
theretofore made to the per share Warrant Price up to and including the date
upon which this Warrant is exercised.

         Section 3.8. Notice of Adjustment; Adjustment of Warrants. Whenever the
per share Warrant Price and number of shares deliverable upon exercise of this
Warrant shall be adjusted pursuant to this Section 3, the Company (a) (i) shall
promptly prepare a certificate signed by the President or a Vice President and
by the Treasurer or an Assistant Treasurer of the Company setting forth, in
reasonable detail, the event requiring the adjustment, the amount of the
adjustment, the method by which such adjustment was calculated (including a
description of the basis on which the Board of Directors of the Company made any
determination hereunder) and (ii) shall promptly prepare, execute and deliver,
at the Company's expense, a new Warrant of the same form and tenor as the
Warrant to be exchanged therefor, but revised to reflect the adjustments
described above, and (b) shall promptly cause copies of such certificate and
(upon surrender of the Warrant requiring adjustment) new Warrant to be mailed
(by first class mail, postage prepaid) to the holder of this Warrant.

                                      -7-
<PAGE>   11

SECTION 4. MERGERS, CONSOLIDATIONS, SALES.

         In the case of any consolidation or merger of the Company with another
entity, or the sale of all or substantially all of its assets to another entity,
or any reorganization or reclassification of the Common Stock or other equity
securities of the Company except a split-up or combination provision for which
provision is made in Section 3.1, then, as a condition of such consolidation,
merger, sale, reorganization or reclassification, lawful and adequate provision
shall be made whereby the holder of this Warrant shall thereafter have the right
to receive upon the basis and upon the terms and conditions specified herein and
in lieu of the shares of Common Stock immediately theretofore purchasable
hereunder, such shares of stock, securities or assets as may (by virtue of such
consolidation, merger, sale, reorganization or reclassification) be issued or
payable with respect to or in exchange for a number of outstanding shares of
Common Stock equal to the number of shares of Common Stock immediately
theretofore so purchasable hereunder had such consolidation, merger, sale,
reorganization or reclassification not taken place, and in any such case
appropriate provisions shall be made with respect to the rights and interests of
the holder of this Warrant to the end that the provisions hereof (including,
without limitation, provisions for adjustment of per share Warrant Price) shall
thereafter be applicable, as nearly as may be, in relation to any shares of
stock, securities or assets thereafter deliverable upon exercise of this
Warrant. The Company shall not effect any such consolidation, merger or sale,
unless prior to or simultaneously with the consummation thereof, the successor
entity (if other than the Company) resulting from such consolidation or merger
or the entity purchasing such assets shall assume by written instrument executed
and mailed or delivered to the holder of this Warrant, the obligation to deliver
to such holder such shares of stock, securities or assets as, in accordance with
the foregoing provisions, such holder may be entitled to receive.

SECTION 5. DISSOLUTION OR LIQUIDATION.

         In the event of any proposed distribution of the assets of the Company
in dissolution or liquidation except under circumstances when the foregoing
Section 3 shall be applicable, the Company shall mail notice thereof to the
holder of this Warrant and shall make no distribution to shareholders until the
expiration of 60 days from the date of mailing of the aforesaid notice and, in
any such case, the holder of this Warrant may exercise the purchase rights with
respect to this Warrant within 60 days from the date of mailing such notice and
all rights herein granted not so exercised within such 60-day period shall
thereafter become null and void.

SECTION 6. NOTICE OF EXTRAORDINARY DIVIDENDS.

         If the Board of Directors of the Company shall declare any dividend or
other distribution on its Common Stock except out of earned surplus or by way of
a stock dividend payable on its Common Stock, the Company shall mail notice
thereof to the holder of this Warrant not less than 30 days prior to the record
date fixed for determining shareholders entitled to participate in such dividend
or other distribution and the holder of this Warrant shall not participate in
such dividend or other distribution or be entitled to any rights on account or
as a result thereof unless and to the extent that this Warrant is exercised
prior to such record date. The provisions of this paragraph shall not apply to
distributions made in connection with transactions covered by Section 3.

                                      -8-
<PAGE>   12
SECTION 7.  FRACTIONAL SHARES.

         Fractional shares shall not be issued upon the exercise of this Warrant
but in any case where the holder hereof would, except for the provisions of this
paragraph, be entitled under the terms hereof to receive a fractional share upon
the complete exercise of this Warrant, the Company shall, upon the exercise of
this Warrant for the largest number of whole shares then called for, pay to the
holders of this Warrant a sum in cash equal to the proportional part of the per
share Warrant Price represented by such fractional share.

SECTION 8.  FULLY PAID STOCK; TAXES.

         The Company covenants and agrees that the shares of stock represented
by each and every certificate for its Common Stock to be delivered on the
exercise of the purchase rights and the payment of the applicable purchase price
herein provided for shall, at the time of such delivery, be validly issued and
outstanding and be fully paid and nonassessable. The Company further covenants
and agrees that it will pay when due and payable any and all Federal and State
taxes (other than income taxes) which may be payable in respect of this Warrant
or any Common Stock or certificates therefor upon the exercise of the conversion
rights herein provided for pursuant to the provisions hereof. The Company shall
not, however, be required to pay any tax which may be payable in respect of any
transfer involved in the transfer and delivery of stock certificates in the name
other than that of the holder exercising this Warrant, and any such tax shall be
paid by such holder at the time of presentation.

SECTION 9.  CLOSING OF TRANSFER BOOKS.

         The right to exercise this Warrant shall not be suspended during any
period that the stock transfer books of the Company for its Common Stock may be
closed. The Company shall not be required, however, to deliver certificates of
its Common Stock upon such exercise while such books are duly closed for any
purpose, but the Company may postpone the delivery of the certificates for such
Common Stock until the opening of such books, and they shall, in such case, be
delivered forthwith upon the opening thereof, or as soon as practicable
thereafter.

SECTION 10. RESTRICTIONS ON TRANSFERABILITY OF WARRANTS AND SHARES; COMPLIANCE
            WITH LAWS.

         Notwithstanding anything contained in this Warrant to the contrary, the
terms and provisions of Section 10 of this Warrant shall remain in full force
and effect at all times up to and including the Expiration Date.

         Section 10.1. In General. This Warrant and the Restricted Stock issued
upon the exercise hereof shall not be transferable except upon the conditions
hereinafter specified, which conditions are intended to insure compliance with
the provisions of the Securities Act of 1933 (or any similar Federal statute at
the time in effect) and any applicable State securities laws in respect of the
transfer of this Warrant or any such Restricted Stock.

                                      -9-
<PAGE>   13

         Section 10.2. Restrictive Legends. Each Warrant shall bear on the face
thereof a legend substantially in the form of the notice endorsed on the first
page of this Warrant.

         Each certificate for shares of Common Stock initially issued upon the
exercise of any Warrant and each certificate for shares of Common Stock issued
to a subsequent transferee of such certificate shall, unless otherwise permitted
by the provisions of this Section 10.2, bear on the face thereof a legend
reading substantially as follows:

                  "The shares represented by this certificate have not been
                  registered under the Securities Act of 1933, as amended, or
                  any State securities laws and may not be sold or transferred
                  in the absence of such registration or an exemption therefrom
                  under said Act and any such State laws which may be applicable
                  and are transferable only upon the conditions specified in the
                  Warrant pursuant to which such shares were issued."

         In the event that a registration statement covering the Underlying
Shares or the Restricted Stock shall become effective under the Securities Act
and under any applicable State securities laws or in the event that the Company
shall receive an opinion of counsel reasonably satisfactory to the Company
(which shall include counsel to the Company and independent counsel to the
original purchaser hereof) that, in the opinion of such counsel, such legend
hereon or on stock certificates is not, or is no longer, necessary or required
(including, without limitation, because of the availability of any exemption
afforded by Rule 144, 144A or 144(k) of the General Rules and Regulations of the
Securities and Exchange Commission (the "Commission")), the Company shall, or
shall instruct its transfer agents and registrars to, remove such legend
herefrom or from the certificates evidencing the Restricted Stock or issue new
certificates without such legend in lieu thereof. In the absence of such
registration or the delivery of such legal opinion, the Company shall not be
required to remove the legend. Upon the written request of the holder or holders
of any Warrant or of any Restricted Stock, the Company covenants and agrees
forthwith to request independent counsel experienced in such matters to render
an opinion with respect to the matters covered by this Section 9.2 and to bear
all expenses (regardless of whether such independent counsel is counsel to the
Company or the holder) in connection with the same.

         Section 10.3. Notice of Proposed Transfer; Registration Not Required.
Other than in connection with a transfer pursuant to Rule 144A or 144(k) of the
General Rules and Regulations of the Commission, the holder of this Warrant or
any Restricted Stock, by acceptance thereof, agrees to give prior written notice
to the Company of such holder's intention to transfer such Warrant or Underlying
Shares relating thereto or such Restricted Stock (or any portion thereof),
describing briefly the manner and circumstances of the proposed transfer;
provided, however, that no such notice shall be required for a transfer under a
registration, qualification or filing for exemption requested in accordance with
the provisions of Section 10.4 or Section 10.6 below. Promptly after receiving
such written notice, the Company shall present copies thereof to Company
counsel. If, in the opinion of such counsel, the proposed transfer may be
effected without registration or qualification under any Federal or State law of
such Warrant or Underlying Shares relating thereto or such Restricted Stock, the
Company, as promptly as practicable, shall notify such holder of such opinion
and of the terms and conditions, if any, to be observed, whereupon such

                                      -10-
<PAGE>   14

holder shall be entitled to transfer such Warrant or Underlying Shares relating
thereto or such Restricted Stock, all in accordance with the terms of the notice
delivered to such holder by the Company. If such counsel is unable to render
such an opinion (in which case said counsel shall set forth in writing the basis
for his legal conclusions in this regard), the proposed transfer described in
the written notice given pursuant to this Section 10.3 may not be effected
except to the extent permitted by and upoN Such registration and/or
qualification or, in lieu thereof, compliance with the conditions of an
exemptive regulation of the Commission and/or any applicable State securities
regulatory authority, as the case may be, and the Company shall promptly notify
such holder and thereafter such holder shall not be entitled to effect such
transfer until receipt of a subsequent notice from the Company pursuant to the
immediately preceding sentence or until such registration or qualification,
filing or compliance has become effective (and consistent with the terms
thereof). All fees and expenses of Company counsel in connection with the
rendition of the opinions provided for in this Section 10.3 shall be paid by the
Company.

         Section 10.4. Required Registration and Notice. If, in the opinion of
counsel to the Company or in the opinion of counsel to any holder (a copy of
which is provided to the Company) a proposed transfer of any Warrant, or the
Underlying Shares relating thereto or such Restricted Stock requested by the
holder thereof may not be effected without registration or qualification under
applicable Federal or State law or filing for exemption, upon the written
request of any holder of any Warrant, or the Underlying Shares relating thereto
or such Restricted Stock setting forth such holder's intent to transfer such
Warrant, or the Underlying Shares relating thereto or such Restricted Stock (or
any portion thereof), describing briefly the manner and circumstances of such
proposed transfer and requesting that the Company effect the registration or
qualification or filing for exemption under applicable Federal or State law of
such Underlying Shares or Restricted Stock, the Company shall promptly give
written notice to all holders of Warrants and Restricted Stock of a proposed
registration or qualification or filing for exemption, and shall, subject to the
conditions of Section 10.5 beLOW, as expeditiously as possible, endeavor, in
good faith, to effect any such registration or qualification or filing for
exemption of

                  (a) such Underlying Shares or Restricted Stock, or both, and

                  (b) all Underlying Shares and Restricted Stock of all holders
         of Warrants or Restricted Stock which shall have advised the Company in
         writing within 30 days after receipt of such written notice by the
         Company of their desire to have their Underlying Shares or Restricted
         Stock registered or qualified or exempted,

with, or notification to or approval of, any governmental authority under any
applicable Federal or State law, or listing with any one securities exchange or
national securities market for the public trading of securities (which shall be
the securities exchange or national securities market on which securities of the
Company are traded, if any), which may be required reasonably to permit the sale
or other disposition of any such Underlying Shares or Restricted Stock which the
holders thereof propose to make promptly upon the effectiveness of such
registration, qualification or filing for exemption. The Company shall advise
each holder hereof in writing, promptly after it receives notice thereof, of the
time of the effectiveness of such registration, qualification or filing for
exemption, of the issuance of any stop order (or the initiating or threatening
of any proceeding for that purpose), or of the suspension of the qualification
of the

                                      -11-
<PAGE>   15

Underlying Shares or Restricted Stock for offering or sale in any jurisdiction
(or the initiating or threatening of any proceeding for that purpose). The
Company will keep effective such registration, qualification, exemption,
notification or approval for such period, not to exceed nine months, as may be
necessary to effect such sales or dispositions and shall, if necessary, amend
and update the registration statement and supplement and update the prospectus
during such period. Without limiting the foregoing, the Company shall send to
each holder hereof or of Restricted Stock, promptly upon the preparation
thereof, copies of all such amendments, updates and supplements and shall advise
each holder hereof in writing, promptly after it receives notice thereof, of the
time of the effectiveness of any such amendment, update or supplement.
Notwithstanding the foregoing, the Company shall not be required to effect
registration of the Warrants themselves.

         Each holder hereof shall receive an opinion of counsel to the Company,
dated the effective date of such registration, qualification or filing for
exemption, subject to customary qualifications and limitations for such opinions
and in a form reasonably satisfactory to such holder, to the effect that the
Company is duly organized, validly existing and in good standing in Texas, the
Underlying Shares or Restricted Stock have been registered under the Securities
Act, the conditions to use by the Company of such form of registration statement
as is filed by the Company under the Securities Act have been satisfied with
respect to such registration, qualification or filing for exemption, and that
such registration, qualification or filing for exemption has become effective
under the Securities Act.

         The Company shall use its reasonable best efforts to cause "cold
comfort" letters of such nationally recognized certified public accounting firm
as the holder hereof shall elect to be delivered to the holder hereof, dated the
date on which such registration, qualification or filing for exemption shall
become effective and addressed to the holder hereof, in form and substance
customary for "cold comfort" letters delivered by independent public accountants
in connection with registrations such as those contemplated by the provisions
hereof.

         The Company shall use its best efforts to register or qualify the
Underlying Shares or Restricted Stock under such securities or blue sky laws of
such United States jurisdictions as any holder hereof reasonably requests to
enable such holder to dispose of such Underlying Shares or Restricted Stock, and
shall furnish to the holder hereof such number of copies of a summary prospectus
or other prospectus in conformity with the requirements of the Securities Act,
and such other documents as such holder may reasonably request in order to
facilitate the public sale or other disposition of such Underlying Shares or
Restricted Stock.

         Section 10.5. Conditions to Required Registration. The Company may
delay (on a one-time basis for any single registration) any registration or
qualification of Underlying Shares or Restricted Stock required pursuant to
Section 10.4 for a period not exceeding 90 days provided the Company shall in
good faith determine that any such registration would adversely affect an
offering or contemplated offering of other Securities by the Company or would
otherwise be materially detrimental to the Company or its shareholders and, in
any event, the Company shall not be required to register, qualify or file or to
use its best efforts to effect any registration, qualification or exemption of
the Underlying Shares or Restricted Stock under the Securities Act or any
applicable State securities law or regulation pursuant to Section 10.4 above:

                                      -12-
<PAGE>   16

                  (a) before the first to occur of (i) a Permitted Exercise
         Event or (ii) January 2, 2005;

                  (b) on more than three occasions (it being acknowledged and
         agreed that in the event less than all of the shares requested to be
         registered pursuant to Section 10.4 are so registered, the holders
         shall not be deemed to have used any of the three demand registration
         rights hereunder); and

                  (c) unless a request therefor is made to the Company by the
         holders of at least 25% of the aggregate number of the Underlying
         Shares and shares of Restricted Stock.

In the event that either the holders of the Underlying Shares or Restricted
Stock to be registered, or the Company, determines that an underwritten offering
is necessary to effectuate the distribution of the Underlying Shares or
Restricted Stock, the lead underwriter shall be selected by the Company and
shall be reasonably acceptable to the holders whose Underlying Shares or
Restricted Stock are covered by the subject registration.

         Section 10.6. Incidental Registration. The Company agrees that at any
time it proposes to register any of its Common Stock under the Securities Act
(other than pursuant to Section 10.4) in connection with an underwritten public
offering of such Common Stock, it will promptly give written notice to all
holders of outstanding Warrants and Restricted Stock of its intention so to do
and upon the written request of the holder of any such Warrants or Restricted
Stock who intends to transfer such Warrants or Restricted Stock promptly upon
the effectiveness of such registration, given within 30 days after receipt of
any such notice from the Company, the Company will in each instance use its best
efforts to cause all Restricted Stock held by any requesting holder to be
registered under said Securities Act and registered or qualified under any State
securities law, all to the extent necessary to permit the sale or other
disposition thereof in the manner stated in such request by the prospective
seller of the securities so registered; provided, however, that the obligation
to give such notice and to use such best efforts shall not apply to any proposal
of the Company to register any of its securities under the Securities Act (i) on
Form S-8 (or any successor form), (ii) in connection with dividend reinvestment
plans, or (iii) for the purpose of offering such securities to another business
entity or the shareholders of such entity in connection with the acquisition of
assets or shares of capital stock, respectively, of such entity or in connection
with a merger or consolidation with such entity. In connection with any offering
involving an underwriting, the Company will not be required to include said
shares unless the holder thereof agrees to the reasonable and customary terms of
the underwriting and then only in such quantity as will not, in the reasonable
opinion of the underwriters, jeopardize the success of the offering by the
Company. Any holder of such Warrants or Restricted Stock requesting registration
of the Underlying Shares relating to such Warrants or such Restricted Stock
shall in its request describe briefly the manner of any proposed transfer of
such Underlying Shares or Restricted Stock. Nothing in this Section 10.6 shall
be deemed to require the Company to proceed with any registration of its
securities after giving the notice herein provided. If some but not all shares
of Restricted Stock and Underlying Shares with respect to which the Company
shall have received requests for registration pursuant to this Section 10.6
shall be excluded from such registration, the Company shall make appropriate
allocation of shares to be registered among all holders of Restricted Stock and
Underlying Shares at the time desiring to register shares pro rata

                                      -13-
<PAGE>   17

in the proportion that the number of shares of Restricted Stock and Underlying
Shares held by each such holder bears to the total number of shares held by all
such holders then desiring to have shares of Restricted Stock and Underlying
Shares registered for sale. The Company will not, after the date of issuance of
this Warrant, grant incidental or piggy-back registration rights to other
holders of equity or equity rights of the Company unless such registration
rights are, by their terms, subject and subordinate to the registration rights
set forth in this Section 10.6.

         Section 10.7. Expenses. The Company will pay all expenses (including
without limitation registration fees, qualification fees, legal expenses,
including the reasonable fees and expenses of one independent counsel to the
holders of Warrants or Restricted Stock whose Underlying Shares relating to such
Warrants or whose Restricted Stock is being registered, printing expenses, the
costs of special audits or "cold comfort" letters and expenses of underwriters,
excluding discounts and commissions but including the fees and expenses of any
necessary special experts) in connection with the registrations (and any related
qualifications, notifications and exemptions) pursuant to Section 10.4. In
addition the Company will pay all such expenses in connection with all
registrations, qualifications, notifications or exemptions pursuant to Section
10.6 and all initial offerings and sales by each such holder of the Restricted
Stock which is being registered in such registrations pursuant to Section 10.6
(excluding underwriters' discount attributable to the Underlying Shares or
Restricted Stock being registered pursuant to Section 10.6).

         Section 10.8. Indemnification. In connection with any registration,
qualification, notification, or exemption of securities under Section 10.4 or
Section 10.6, the Company hereby agrees to indemnify the holder of the Warrants
and/or Restricted Stock, and each underwriter thereof including each person, if
any, who controls such Warrant holder or stockholder within the meaning of
Section 15 of the Securities Act, against all losses, claims, damages and
liabilities caused by any untrue, or alleged untrue, statement of a material
fact contained in any registration statement or prospectus or notification or
offering circular (and as amended or supplemented if the Company shall have
furnished any amendments or supplements thereto) or any preliminary prospectus
or caused by any omission, or alleged omission, to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading, except insofar as such losses, claims, damages or liabilities are
caused by any untrue statement or alleged untrue statement or omission based
upon information furnished in writing to the Company by such holder or, as the
case may be, any such underwriter expressly for use therein, such
indemnification to remain in full force and effect regardless of any
investigation made by or on behalf of the indemnified party or any partner,
member, officer, director or controlling person of such indemnified party and
will survive the transfer of this Warrant, the Underlying Shares or Restricted
Stock. The Company and each officer, director and controlling person of the
Company shall be indemnified by each holder of Warrants and/or Restricted Stock
for all such losses, claims, damages and liabilities caused by any untrue, or
alleged untrue, statement or omission, or alleged omission, based upon
information furnished in writing to the Company by such holder for any such use.

        Promptly upon receipt by a party indemnified under this Section 10.8 of
notice of the commencement of any action against such indemnified party in
respect of which indemnity or reimbursement may be sought against any
indemnifying party under this Section, such indemnified party shall notify the
indemnifying party in writing of the commencement of such

                                      -14
<PAGE>   18

action, but the failure so to notify the indemnifying party shall not relieve it
of any liability which it may have to any indemnified party otherwise than under
this Section 10.8. In case notice of commencement of any such action shall be
given to the indemnifying party as above provided, the indemnifying party shall
be entitled to participate in and, to the extent it may wish, jointly with any
other indemnifying party similarly notified, to assume the defense of such
action at its own expense, with counsel chosen by it and satisfactory to such
indemnified party. The indemnified party shall have the right to employ separate
counsel in any such action and participate in the defense thereof, but the fees
and expenses of such counsel (other than reasonable costs of investigation)
shall be paid by the indemnified party unless the indemnifying party either
agrees to pay the same or fails to assume the defense of such action with
counsel satisfactory to the indemnified party. No indemnifying party shall be
liable for any settlement entered into without its consent which consent shall
not be unreasonably withheld.

         Section 10.9. Contribution. If the indemnification provided for in
Section 10.8 hereof is unavailable or insufficient to hold harmless an
indemnified party in respect of any losses referred to therein, then each
indemnifying party shall contribute to the amount paid or payable by such
indemnified party as a result of such losses in such proportion as is
appropriate to reflect the relative fault of the indemnified party, on one hand,
and such indemnifying party, on the other hand, in connection with the
statements or omissions which resulted in such losses. The relative fault shall
be determined by reference to whether the untrue or alleged untrue statement of
a material fact or the omission or alleged omission to state a material fault
relates to information supplied by the indemnified party, on one hand, or such
indemnifying party, on the other hand, and the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
statement or omission. Notwithstanding the provisions of this Section 10.9, the
holder hereof shall not be required to contribute any amount in excess of the
amount by which the total proceeds received by such holder from the sale
pursuant to the registration with respect to which the registration statement,
preliminary or final prospectus, or amendments or supplements thereto,
containing such statement, omission or alleged omission related exceeds the
amount of any damages which such holder has otherwise been required to pay by
reason of such statement, omission or alleged omission. No person guilty of
fraudulent misrepresentation (within the meaning of the Securities Act) shall be
entitled to contribution from any person who was not guilty of such fraudulent
misrepresentation. The amount paid or payable by an indemnified party as a
result of the losses referred to above in this Section 10.9 shall be deemed to
include any legal or other expenses reasonably incurred by such indemnified
party in connection with investigating or defending and such action or claim.

SECTION 11. PARTIAL ASSIGNMENT.

         If this Warrant is partially assigned, this Warrant shall be
surrendered at the principal office of the Company (with the partial assignment
form at the end hereof duly executed), and thereupon a new Warrant shall be
issued to the holder hereof covering the number of shares not assigned and
setting forth the proportionate Aggregate Warrant Price applicable to such
shares not assigned. The assignee of such partial assignment of this Warrant
shall also be entitled to receive a new Warrant covering the number of shares so
assigned and setting forth the proportionate aggregate Warrant Price applicable
to such assigned shares.

                                      -15-
<PAGE>   19

SECTION 12. WARRANT DENOMINATIONS.

         Warrants are issuable or transferable in the denomination of 10 shares
or any integral multiple thereof (as nearly as may be practicable and subject to
required adjustments hereunder), or such amount as represents 100% of the shares
purchasable hereunder and the Warrants of each denomination are interchangeable
upon surrender thereof at the office of the Company for Warrants of other
denominations, but aggregating the same number of shares as the Warrants so
surrendered. All Warrants will be dated the same date as this Warrant.

SECTION 13. REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE COMPANY.

         The Company represents and warrants to you that (which representations
and warranties, as of the date originally made, shall survive the exercise
hereof):

         Section 13.1. Organization; Power and Authority. The Company is a
corporation duly organized, validly existing and in good standing under the laws
of its jurisdiction of incorporation, and is duly qualified as a foreign
corporation and is in good standing in each jurisdiction in which such
qualification is required by law, other than those jurisdictions as to which the
failure to be so qualified or in good standing could not, individually or in the
aggregate, reasonably be expected to have a material adverse effect.

         Section 13.2. Authorization, etc. This Warrant has been duly
authorized by all necessary corporate action on the part of the Company and
constitutes a legal, valid and binding obligation of the Company enforceable
against the Company in accordance with its terms, except as such enforceability
may be limited by (i) applicable bankruptcy, insolvency, reorganization,
moratorium or other similar laws affecting the enforcement of creditors' rights
generally and (ii) general principles of equity (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

         Section 13.3. Organization and Ownership of Shares of Subsidiaries. (a)
Schedule 11.3 contains (except as noted therein) complete and correct lists of
the Company's Subsidiaries.

         (b) All of the outstanding shares of capital stock or similar equity
interests of each Subsidiary have been validly issued, are fully paid and
nonassessable and are owned by the Company or another Subsidiary free and clear
of any lien. The authorized capital stock of the Company consists of 50,000,000
shares of Common Stock, with $0.05 par value and 5,000,000 shares of Preferred
Stock, without par value. As of the date hereof, the Company has outstanding
18,423,707 shares of Common Stock and 509,167 shares of Series A Convertible
Preferred Stock. The Company has, as of the date hereof, reserved 2,000,000
shares of Common Stock for issuance upon exercise of the Warrants. After giving
effect to the transactions on the date of the Closing, the Company shall have
18,423,707 shares of Common Stock determined on a fully diluted basis and shall
have no other capital stock outstanding (excluding the Series A Convertible
Preferred Stock of the Company and all shares of Common Stock issuable under the
Special Stock Plans). There are no outstanding preemptive rights and no
outstanding options to purchase, or any rights or warrants to subscribe for, or
any commitments or agreements to issue or sell, or any securities or obligations
convertible into, or any powers of attorney relating to,

                                      -16-
<PAGE>   20

shares of the capital stock of the Company or any subsidiary, or any agreements
or instruments binding upon the Company or any Subsidiary relating to the
ownership of its shares of any such capital stock (excluding the Series A
Convertible Preferred Stock of the Company and the Special Stock Plans).

         Section 13.4. Compliance with Laws, Other Instruments, etc. Neither the
execution, delivery and performance by the Company of this Warrant nor the
issuance, sale, delivery and performance by the Company of this Warrant will (i)
contravene, result in any breach of, or constitute a default under, or result in
the creation of any lien in respect of any property of the Company or any
Subsidiary under, any indenture, mortgage, deed of trust, loan, purchase or
credit agreement, lease, corporate charter or by-laws, or any other agreement or
instrument to which the Company or any Subsidiary is bound or by which the
Company or any Subsidiary or any of their respective properties may be bound or
affected, (ii) conflict with or result in a breach of any of the terms,
conditions or provisions of any order, judgment, decree, or ruling of any court,
arbitrator or governmental authority applicable to the Company or any Subsidiary
or (iii) violate any provision of any statute or other rule or regulation of any
governmental authority applicable to the Company or any Subsidiary.

         Section 13.5. Governmental Authorizations, etc. No consent, approval or
authorization of, or registration, filing or declaration with, any governmental
authority is required in connection with the execution, delivery or performance
by the Company of this Warrant.

         Section 13.6. Private Offering by the Company. Neither the Company nor
anyone acting on its behalf has offered the Warrants or any similar securities
for sale to, or solicited any offer to buy any of the same from, or otherwise
approached or negotiated in respect thereof with, any person other than the
holders of the Outstanding Notes (as defined in the 2000-B Amendment and Warrant
Agreement dated as of September 29, 2000).

         So long as this Warrant or any Restricted Stock shall be outstanding:

         Section 13.7. Limitations on Amendment to Articles of Incorporation.
The Company shall not amend its Articles of Incorporation or By-laws (i) to
create any new class of capital stock, (ii) to change the voting rights of the
holders of capital stock of the Company, or (iii) so as to affect this Warrant
or any Restricted Stock or a holder thereof adversely.

         Section 13.8. No Impairment. The Company shall not by any action,
including, without limitation, any reorganization, recapitalization, transfer of
assets, consolidation, merger, dissolution, issue or sale of securities or any
other voluntary action, avoid or seek to avoid the observance or performance of
any of the terms of the Warrants, but rather will at all times in good faith
assist in the carrying out of all such terms and in the taking of all such
action as may be necessary or appropriate to protect the rights of the holder
hereof against impairment. Without limiting the generality of the foregoing, the
Company (a) will not permit the par value of any Common Stock issuable upon
exercise of the Warrants to be greater than the amount payable therefor upon
such exercise, (b) will take all such action as may be reasonably necessary or
appropriate in order that the Company may validly issue fully paid and
nonassessable Common Stock, (c) will obtain and maintain all such
authorizations, exemptions or consents from any

                                      -17-
<PAGE>   21

public regulatory body having jurisdiction as may be necessary to enable the
Company to perform its obligations under this Agreement and the Warrants and (d)
will not issue any capital stock or enter into any agreement, the terms of which
would have the effect, directly or indirectly, of preventing the Company from
honoring its obligations hereunder. The Company shall not permit the par value
of its Common Stock to exceed an amount equal to the per share Warrant Price.

         Section 13.9. Indemnification. Without limiting the generality of any
other provision hereof or of the Existing Note Purchase Agreements (as defined
in the 2000-B Amendment Warrant Agreement dated as of September 29, 2000),
except as otherwise expressly provided herein, the Company shall indemnify, save
and hold harmless the holder of any Warrant and the holder of any Common Stock
from and against any and all liability, loss, cost, damage, reasonable
attorneys' and accountants' fees and expenses, court costs and all other
out-of-pocket expenses incurred by such holder in connection with exercising
and/or enforcing any of the terms hereof.

         Section 13.10. Requested Information. The Company shall provide, with
reasonable promptness, any such data and information relating to the business,
operations, affairs, financial condition, assets or properties of the Company as
from time to time may be reasonably requested by any holder hereof, including,
without limitation, such information as is required by Rule 144A of the General
Rules and Regulations of the Commission to be delivered to the prospective
transferee of this Warrant.

SECTION 14. DEFINITIONS.

         In addition to the terms defined elsewhere in this Warrant, the
following terms have the following respective meanings (capitalized terms used
herein and not otherwise defined shall have the meaning ascribed to such terms
in the Note Purchase Agreements dated as of September 15, 1998, as amended, but
without regard to any termination of said Note Purchase Agreements or payment of
the Notes issued hereunder):

         The term "Additional Shares of Common Stock" shall mean all shares of
Common Stock issued by the Company after September 29, 2000, including any
shares of Common Stock issuable or issued upon the exercise of Convertible
Securities, but excluding (i) Common Stock issued upon exercise of the Warrants
and (ii) Common Stock issuable pursuant to the exercise of options delivered
pursuant to the Special Stock Plans or pursuant to the conversion of Series A
Convertible Preferred Stock of the Company.

         The term "Aggregate Warrant Price" is defined and set forth in the
second paragraph of this Warrant.

         The term "Change of Control" shall be deemed to have occurred if any
person (as such term is used in section 13(d) of section 14(d)(2) of the
Securities and Exchange Act of 1934, as in effect on September 29, 2000 (the
"Exchange Act")) or related persons constituting a group (as such term is used
in Rule 13(d)-5 under the Exchange Act), become the "beneficial owners" (as such
term is used in Rule 13(d)-3 under the Exchange Act as in effect on September
29,

                                      -18-

<PAGE>   22

2000), directly or indirectly, of more than 50% of the total voting power of all
classes then outstanding of the Company's voting stock.

         The term "Common Stock" shall mean, collectively, (i) the Company's
Common Stock described in Article Four of the Restated Articles of Incorporation
of the Company, (ii) any other capital stock of the Company hereafter authorized
which is not limited to a fixed sum or percentage of par or stated value in
respect to the rights of the holders thereof to participate in dividends or in
the distribution of assets upon any liquidation, dissolution or winding up of
the Company and (iii) any other class or classes of Voting Stock. It is
acknowledged that common stock of the Company issued pursuant to the exercise of
options delivered to the pursuant Special Stock Plans and common stock of the
Company issued pursuant to conversion of the Series A Convertible Preferred
Stock of the Company shall be included in any determination of Common Stock.

         The term "Commission" shall mean the Securities and Exchange
Commission, or any other Federal agency at the time administering the Securities
Act.

         The term "Convertible Securities" shall mean evidences of indebtedness,
shares of stock or other securities which are convertible into or exchangeable
for shares of Voting Stock, either immediately or upon the arrival of a
specified date or the happening of a specified event, which conversion rights
have not expired or terminated. Shares of stock which are issuable (but not, in
fact, issued) pursuant to the exercise of options delivered pursuant to the
Special Stock Plans or pursuant to the conversion of Series A Convertible
Preferred Stock of the Company shall not be included in any determination of
Convertible Securities.

         The term "Current Market Price" per share of Common Stock for the
purposes of any provision of this Warrant, shall be, as of the date of any
determination thereof, an amount equal to the average of the daily market price
per share for the twenty-five (25) consecutive Business Days occurring most
recently prior to the subject issuance of such shares of Common Stock. The
market price for each such Business Day shall be deemed to be (i) if the Common
Stock shall at the time be listed or admitted to unlisted trading privileges on
the New York Stock Exchange, on the basis of the last reported sale price
regular way of the Common Stock on the Composite Tape (or if the Common Stock at
the time be not so listed or admitted to unlisted trading privileges on the New
York Stock Exchange but be listed or admitted to unlisted trading privileges on
another national securities exchange, on the basis of the last reported sale
price regular way on a national securities exchange on which the Common Stock is
at the time listed or admitted to unlisted trading privileges) on such date, or
(ii) if the Common Stock is not at the time so listed or admitted to unlisted
trading privileges on a national securities exchange, on the basis of the
average of the highest reported bid and lowest reported asked prices of the
Common Stock in the over-the-counter market on such date, as reported by the
National Association of Securities Dealers Automated Quotations System
("NASDAQ") or similar organization if NASDAQ is no longer reporting such
information, or (iii) if the Common Stock is not at the time so listed or
admitted to unlisted trading privileges on a national securities exchange or
reported by NASDAQ or a similar organization, then the Current Market Price per
share of Common Stock determined in good faith by the Board of Directors of the
Company.

                                      -19-
<PAGE>   23

         The term "Exercise Date" shall mean a date on which this Warrant is
exercised.

         The term "Initial per share Warrant Price" shall mean $0.05 per share.

         The term "Notes" shall mean and include each of the Senior Notes, as
amended, issued by the Company pursuant to the Note Purchase Agreements dated as
of September 15, 1998, as amended or pursuant to the Amended and Restated Note
Purchase Agreements dated as of September 15, 1998, as amended.

         The term "Permitted Exercise Event" shall mean and include (i) any
Event of Default under either the Note Purchase Agreements dated as of September
15, 1998, as amended, of the Company or the Amended and Restated Note Purchase
Agreements dated as of September 15, 1998, as amended, of the Company and, in
each case, respectively, the institutional investors named therein, as amended
from time to time, described in Sections 11(g) or (h) thereof or (ii) a Change
of Control.

         The term "Restricted Stock" shall mean the shares of Common Stock of
the Company issued upon the exercise of any of the Warrants (including, without
limitation, any such exercise during the 30-Day Registration Notice Period) and
evidenced by a certificate required to bear the legend specified in Section
10.2.

         The term "Securities Act" shall mean the Securities Act of 1933, or any
similar Federal statute, and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time.

         The term "Special Stock Plans" shall mean and include (i) the American
Homestar Corporation 1994 amended and restated stock compensation plan with an
effective date of October 14, 1996 as in effect on September 30, 2000, (ii) the
American Homestar Corporation Market Capitalization Enhancement Stock Option
Plan with an effective date of August 31, 1998, as in effect on September 30,
2000, (iii) American Homestar Nonqualified Stock Option Agreements, dated
November 15, 1996, for each of Buck Teeter and Ladd Dawson, (iv) BHI Stock
Option Agreement dated June 5, 1997, (v) Stock Option Agreement in connection
with acquisition of Homemax, (vi) Stock Option Agreement in connection with
acquisition of R-Anell and (vii) Stock Option Agreement in connection with First
Value Homes.

         The term "30-Day Registration Notice Period" shall mean the 30-day
period after the Company has given written notice to the holders of all Warrants
and Restricted Stock of a proposed registration pursuant to Section 10.4 or
Section 10.6 hereof.

         The term "Underlying Shares" shall mean the shares of Common Stock of
the Company issuable upon exercise of any of the Warrants.

         The term "Voting Stock" shall mean securities of any class, the holders
of which are ordinarily, in the absence of contingencies, entitled to vote for
the election of the Board of Directors. For purposes of determining the number
of shares of Voting Stock outstanding, each share of Voting Stock of the Company
shall be deemed to constitute that number of shares equal

                                      -20-
<PAGE>   24

to the number of votes that such share is entitled to vote toward the election
of the Board of Directors.

         The term "Warrant" and "Warrants" as used herein shall mean this
Warrant and all warrants hereafter issued in exchange or substitution for this
Warrant and all other Warrants issued pursuant to the 2000-B Amendment and
Warrant Agreement dated as of September 30, 2000.

SECTION 15. LOST, STOLEN WARRANTS, ETC.

         In case this Warrant shall be mutilated, lost, stolen or destroyed, the
Company may issue a new Warrant of like date, tenor and denomination and deliver
the same in exchange and substitution for and upon surrender and cancellation of
the mutilated Warrant, or in lieu of the Warrant lost, stolen or destroyed, upon
receipt of evidence satisfactory to the Company of the loss, theft or
destruction of such Warrant, and upon receipt of indemnity satisfactory to the
Company.

SECTION 16. WARRANT HOLDER NOT SHAREHOLDER.

         This Warrant does not confer upon the holder hereof any right to vote
or to consent or to receive notice as a shareholder of the Company, as such, in
respect of any matters whatsoever, or any other rights or liabilities as a
shareholder, prior to the exercise hereof as hereinbefore provided.

SECTION 17. SEVERABILITY.

         Should any part of this Warrant for any reason be declared invalid,
such decision shall not affect the validity of any remaining portion, which
remaining portion shall remain in force and effect as if this Warrant had been
executed with the invalid portion thereof eliminated, and it is hereby declared
the intention of the parties hereto that they would have executed and accepted
the remaining portion of this Warrant without including therein any such part,
parts or portion which may, for any reason, be hereafter declared invalid.

SECTION 18. INDEX AND CAPTIONS.

         The index and the descriptive headings of the various sections of this
Warrant are for convenience only and shall not affect the meaning or
construction of the provisions hereof.

SECTION 19. REPRESENTATION OF HOLDER.

         The initial holder hereof represents (by its acceptance of delivery of
this Warrant) that it is taking this Warrant for its own account or for one or
more separate accounts maintained by it or for the account of one or more
pension or trust funds and not with a view towards the distribution thereof,
provided that the disposition of its or their property shall at all times be or
remain within its or their control.

                                      -21-
<PAGE>   25

         IN WITNESS WHEREOF, American Homestar Corporation has caused this
Warrant to be signed by its President or one of its Vice Presidents and its
corporate seal to be hereunto affixed and attested by its Secretary or one of
its Assistant Secretaries and this Warrant to be dated September 29, 2000.

                                              AMERICAN HOMESTAR CORPORATION

                                              By
                                                Its ________________ President

                                      -22-

<PAGE>   26

                                  SUBSCRIPTION

AMERICAN HOMESTAR CORPORATION

         The undersigned, ______________________, pursuant to the provisions of
the within Warrant, hereby elects to purchase _______ shares of Common Stock of
American Homestar Corporation covered by the within Warrant.

                                             Signature
                                                      -------------------------
                                             Address
                                                    ---------------------------

Dated:
      -------------------

                                      -23-
<PAGE>   27

                                   ASSIGNMENT

         FOR VALUE RECEIVED _______________________ hereby sells, assigns and
transfers unto _____________________ the within Warrant and all rights evidenced
thereby and does irrevocably constitute and appoint ______________________,
attorney, to transfer the said Warrant on the books of the within named Company.

                                              ---------------------------------

Dated:
      -------------------------

                               PARTIAL ASSIGNMENT

     FOR VALUE RECEIVED ______________________ hereby sells, assigns and
transfers unto _____________________ that portion of the within Warrant and the
rights evidenced thereby which will on the date hereof entitle the holder to
purchase ____% shares of Common Stock of American Homestar Corporation and
irrevocably constitutes and appoints _________________________, attorney, to
transfer that part of the said Warrant on the books of the within named Company.

                                            ------------------------------------

Dated:
      ------------------------------------

                                      -24-<PAGE>   1
                                                                   Exhibit 10.22

                            STOCK PURCHASE AGREEMENT

         This Stock Purchase Agreement (this "Agreement") is dated as of June
28, 2000, by and among American Homestar Corporation, a Texas corporation
("Seller"), XXI Holding Co. Inc., a Delaware corporation ("Buyer") and 21st
Century Mortgage Corporation, a Delaware corporation (the "Company").

                        --------------------------------

         Buyer desires to purchase from Seller and Seller desires to sell to
Buyer 2,500,000 shares of the common stock (the "Shares") of the Company, which
shares constitute 50% of the issued and outstanding shares of capital stock of
the Company, upon the terms and subject to the conditions hereinafter set forth.

         Accordingly, intending to be legally bound, the parties hereto hereby
agree as follows:

                                   ARTICLE I.
                    PURCHASE AND SALE OF THE SHARES; CLOSING

         1.1 Purchase and Sale of the Shares. On the terms and subject to the
conditions of this Agreement, Seller hereby agrees to sell, transfer and deliver
to Buyer, and Buyer hereby agrees to purchase from Seller, the Shares for an
aggregate purchase price of Six Million Three Hundred Thousand Dollars
($6,300,000) (the "Purchase Price").

         1.2 Payment of Purchase Price. The Purchase Price shall be paid in cash
at Closing (as defined below).

         1.3 Closing. The closing of the transaction contemplated hereby (the
"Closing") shall occur on the date hereof, at the offices of Buyer or at such
other time and location as determined by the parties. At Closing, Seller shall
deliver to Buyer all certificates representing the Shares, properly endorsed to
Buyer.

                                  ARTICLE II.
                            OTHER CLOSING DELIVERIES

         2.1 Other Closing Deliveries. As a condition to the Closing, at the
Closing, the parties shall deliver, or cause to be delivered, to each other, the
following:

                  (a) Seller and the Company shall enter into a Limited
         Liability Company Agreement, in the form of which is attached hereto as
         Exhibit A, and Seller shall make a $2,400,000 capital contribution to
         the LLC (as defined below) in cash from the proceeds of the sale of the
         Shares, and the Company shall make a $2,400,000 capital contribution to
         the LLC in cash.

                                       1
<PAGE>   2

                  (b) The Company and Homestar 21, LLC (the "LLC") shall execute
         and deliver the June 2000 Revenue Sharing Agreement, in the form
         attached hereto as Exhibit B.

                  (c) The Seller and the Company shall execute and deliver the
         Manufactured Home Dealer Agreement of even date herewith, in the form
         attached hereto as Exhibit C.

                  (d) Seller shall deposit with the Company $1,000,000 cash from
         the proceeds of the sale of Shares as required in Section 4.2 below.

                  (e) The parties to the Security Holders Agreement of the
         Company, dated as of September 14, 1995 (the "Securityholders
         Agreement"), shall have executed and delivered to each other an
         amendment, the form of which is attached hereto as Exhibit D.

                  (f) Seller shall deliver to the Company resignation letters
         for each director of the Company designated by Seller.

                  (g) The Company will pay to Seller in cash the amounts listed
         on Exhibit E attached hereto. ---------

                  (h) The Company and Vanderbilt Mortgage and Finance, Inc.
         shall have executed and delivered the Sales and Servicing Agreement the
         form of which is attached hereto as Exhibit F. ---------

                                  ARTICLE III.
                         REPRESENTATIONS AND WARRANTIES

         3.1 Representations and Warranties of Seller. Seller hereby represents
and warrants to Buyer as follows:

                  (a) Authority. Seller is a corporation duly organized, validly
         existing and in good standing under the laws of the State of Texas.
         Seller has all requisite corporate power and authority to enter into
         this Agreement and the other agreements, documents and instruments
         described in Article II above (collectively with the Agreement, the
         "Transaction Documents") and to consummate the transactions
         contemplated in the Transaction Documents. All corporate acts and other
         proceedings required to be taken by Seller to authorize the execution,
         delivery and performance of the Transaction Documents and the
         consummation of the transactions contemplated thereby have been duly
         and properly taken. The Transactions Documents have been duly executed
         and delivered by Seller and constitute valid and binding obligations of
         Seller, enforceable against Seller in accordance with their respective
         terms. The execution and delivery of the Transaction Documents do not,
         and the consummation of the transactions contemplated thereby and
         compliance with the terms thereof will not result in any violation of
         or default, except for violations or defaults which would not,
         individually or in the aggregate, have a material adverse effect, under
         (i) any provision of the Certificate of Incorporation or By-laws of
         Seller, (ii) any note, bond, mortgage, indenture, deed of trust,
         license, lease, contract, commitment or agreement to which Seller is a
         party or (iii) any judgment, order or decree, or statute, law
         ordinance, rule or regulation applicable to

                                       2
<PAGE>   3

         Seller or to the property or assets of Seller. No consent is required
         to be obtained or made by or with respect to Seller in connection with
         the execution and delivery of the Transaction Documents or the
         consummation by Seller of the transactions contemplated thereby, other
         than (A) compliance with applicable securities laws, (B) those consents
         previously obtained by Seller, and (C) those consents the failure to
         obtain which would not, individually or in the aggregate, have a
         material adverse effect on the business of Seller.

                  (b) The Shares. Seller owns of record and beneficially
         2,500,000 Shares of the Company. Seller owns the Shares free and clear
         of any claims, liens, encumbrances, security interests, options,
         charges or restrictions whatsoever except as set forth in the
         Securityholders Agreement ("Encumbrances").

                  (c) Litigation. To Seller's knowledge and belief, as of the
         date of this Agreement, there are no lawsuits, claims, proceedings or
         investigations pending or threatened by or against or affecting
         Seller's or any of its properties, assets, operations or business,
         including the Shares, that do or would have a material effect on
         Seller's operations.

         3.2 Representations and Warranties of Buyer. Buyer hereby represents
and warrants to Seller as follows:

                  (a) Authority. Buyer is a corporation duly organized, validly
         existing and in good standing under the laws of the State of Delaware.
         Buyer has all requisite corporate power and authority to enter into the
         Transaction Documents and to consummate the transactions contemplated
         thereby. All corporate acts and other proceedings required to be taken
         by Buyer to authorize the execution, delivery and performance of the
         Transaction Documents and the consummation of the transactions
         contemplated thereby have been duly and properly taken. The Transaction
         Documents have been duly executed and delivered by Buyer and constitute
         valid and binding obligations of Buyer, enforceable against Buyer in
         accordance with their respective terms. The execution and delivery of
         the Transaction Documents do not, and the consummation of the
         transactions contemplated thereby and compliance with the terms thereof
         will not result in any violation of or default, except for violations
         or defaults which would not, individually or in the aggregate, have a
         material adverse effect, under (i) any provision of the Certificate of
         Incorporation or By-laws of Buyer, (ii) any note, bond, mortgage,
         indenture, deed of trust, license, lease, contract, commitment or
         agreement to which Buyer is a party or (iii) any judgment, order or
         decree, or statute, law ordinance, rule or regulation applicable to
         Buyer or to the property or assets of Buyer. No consent is required to
         be obtained or made by or with respect to Buyer in connection with the
         execution and delivery of the Transaction Documents or the consummation
         by Buyer of the transactions contemplated thereby, other than (A)
         compliance with applicable securities laws, (B) those consents
         previously obtained by Buyer, and (C) those consents the failure to
         obtain which would not, individually or in the aggregate, have a
         material adverse effect on the business of Buyer.

                                       3
<PAGE>   4

                  (b) To Buyer's knowledge and belief, as of the date of this
         Agreement, there are no lawsuits, claims, proceedings or investigations
         pending or threatened by or against or affecting Buyer or any of its
         properties, assets, operations or business, including the Shares, that
         do or would have a material effect on Buyer's operations.

                  (c) If Buyer or the Company or any shareholder of either the
         Buyer or the Company, within 180 days of the Closing, sells or agrees
         to sell any shares of the Company at a price greater than $2.52 per
         share, Buyer will promptly thereafter pay to Seller an amount equal to
         the product of the difference between such share sales price and $2.52
         multiplied by 2,500,000.

                  (d) To Buyer's knowledge and belief, as of the date of this
         Agreement, there is no material information relating to the Company or
         its prospects that has not been disclosed to or is not otherwise known
         to Seller (including, without limitation, any possible investments,
         joint ventures or similar transactions by the Company).

         3.3 Representations and Warranties of the Company. The Company hereby
represents and warrants to Seller as follows:

                  (a) Authority. The Company is a corporation duly organized,
         validly existing and in good standing under the laws of the State of
         Delaware. The Company has all requisite corporate power and authority
         to enter into the Transaction Documents and to consummate the
         transactions contemplated thereby. All corporate acts and other
         proceedings required to be taken by the Company to authorize the
         execution, delivery and performance of the Transaction Documents and
         the consummation of the transactions contemplated thereby have been
         duly and properly taken. The Transaction Documents have been duly
         executed and delivered by the Company and constitute valid and binding
         obligations of the Company, enforceable against the Company in
         accordance with their respective terms. The execution and delivery of
         the Transaction Documents do not, and the consummation of the
         transactions contemplated thereby and compliance with the terms hereof
         will not result in any violation of or default, except for violations
         or defaults which would not, individually or in the aggregate, have a
         material adverse effect, under (i) any provision of the Certificate of
         Incorporation or By-laws of the Company, (ii) any note, bond, mortgage,
         indenture, deed of trust, license, lease, contract, commitment or
         agreement to which the Company is a party or (iii) any judgment, order
         or decree, or statute, law ordinance, rule or regulation applicable to
         the Company or to the property or assets of the Company. No consent is
         required to be obtained or made by or with respect to the Company in
         connection with the execution and delivery of the Transaction Documents
         or the consummation by the Company of the transactions contemplated
         thereby, other than (A) compliance with applicable securities laws, (B)
         those consents previously obtained by the Company, and (C) those
         consents the failure to obtain which would not, individually or in the
         aggregate, have a material adverse effect on the business of the
         Company.

                  (b) To the Company's knowledge and belief, as of the date of
         this Agreement, there are no lawsuits, claims, proceedings or
         investigations pending or threatened by or

                                       4
<PAGE>   5

         against or affecting the Company or any of its properties, assets,
         operations or business that do or would have a material effect on the
         Company's operations.

                  (c) To the Company's knowledge and belief, as of the date of
         this Agreement, there is no material information relating to the
         Company or its prospects that has not been disclosed to or is not
         otherwise known to Seller (including, without limitation, any possible
         investments, joint ventures or similar transactions by the Company).

                                  ARTICLE IV.
                                OTHER AGREEMENTS

         4.1 From time to time, as and when requested by any party hereto, the
other parties shall execute and deliver, or cause to be executed and delivered,
all such documents and instruments and shall take, or cause to be taken, all
such further or other actions as may reasonably be necessary or desirable to
consummate the transactions contemplated by this Agreement

         4.2 Required Guaranty Deposit for the Obligation of Seller Under the
1995 Dealer Agreement.

                  (a) Notwithstanding anything herein or any other agreement or
         document by and between Seller and the Company, the agreements between
         the parties relating to the sale, handling and financing of
         repossessions under the Manufactured Home Dealer Agreement, dated
         November 21, 1995, and all subsequent amendments thereto, by and
         between the Company and Seller shall be exclusively as provided in
         Exhibit G attached hereto.

                  (b) In order to establish a short term credit facility
         (hereinafter the "Repo Line") to be used by the Company and Seller to
         meet their obligations to payoff repossessions of Contracts (as that
         term is defined in Exhibit G hereto) sold to Investors (as that term is
         defined in Exhibit G hereto), Seller will deposit with the Company
         $1,000,000 in cash from the proceeds of the sale of the Shares. The
         Company shall hold the deposit in an interest bearing account for the
         benefit of Seller and may pledge the deposit as required by any
         financial institution, including the Company that provides the Repo
         Line.

         Until the later of August 31, 2000, or until such time as the Company
         can secure a bank line, the Repo Line provided by the Company shall be
         in the amount of $2,000,000, utilizing the $1,000,000 Seller deposit as
         collateral. The Company shall attempt to secure a bank line in the
         amount of $2,000,000 utilizing the $1,000,000 Seller deposit as
         collateral.

         4.3 Until August 1, 2001, as long as Associates Housing Finance, LLC
("AHF") continues to conduct business with the Company in a manner substantially
consistent with its conduct and practices prior to the Closing, the Company will
continue to operate with AHF as the Company did prior to the Closing. In the
event AHF changes its conduct and practices with the Company in such a manner
that has a material adverse impact on the Company, the Company will notify
Seller of such changes, and 20 days after giving such notice if AHF and the
Company

                                       5
<PAGE>   6

have not resolved the change that caused the material adverse impact or, if
after working with AHF, Seller has not reasonably resolved the change that
caused the material adverse impact or agreed to mitigate such material adverse
impact, the Company may exercise all the options available to it in the
agreement between AHF and the Company.

                                   ARTICLE V.
                                 INDEMNIFICATION

         5.1 Indemnification by Seller. Seller hereby agrees to indemnify Buyer
and its affiliates and their respective officers, directors and shareholders
against and hold them harmless from any loss, liability, claim, damage or
expense (including reasonable legal fees and expenses) (a "Loss") suffered or
incurred by any such indemnified party as a consequence of any inaccuracy or
breach of, or nonfulfillment of, any representation, warranty, agreement or
covenant of Seller under this Agreement or any exhibit, certificate, document or
instrument required to be delivered pursuant hereto.

         5.2 Indemnification by Buyer. Buyer hereby agrees to indemnify Seller
and its affiliates and their respective officers, directors and shareholders
against and hold them harmless from any loss, liability, claim, damage or
expense (including reasonable legal fees and expenses) (a "Loss") suffered or
incurred by any such indemnified party as a consequence of any inaccuracy or
breach of, or nonfulfillment of, any representation, warranty, agreement or
covenant of Buyer under this Agreement or any exhibit, certificate, document or
instrument required to be delivered pursuant hereto.

                                  ARTICLE VI.
                                  MISCELLANEOUS

         6.1 Assignment. This Agreement and the rights hereunder shall not be
assignable or transferable by Buyer or Seller without the prior written consent
of the other party hereto. This Agreement shall inure to the benefit of, and be
binding upon and enforceable against, the successors and permitted assigns of
the respective parties hereto.

         6.2 No Third-Party Beneficiaries. Except as otherwise specifically
provided in this Agreement, this Agreement is for the sole benefit of the
parties hereto and their permitted assigns and nothing herein expressed or
implied shall give or be construed to give to any person or entity, other than
the parties hereto and such assigns, any legal or equitable rights hereunder.

         6.3 Survival of Representations. The representations, warranties and
indemnities in this Agreement shall survive the Closing and shall remain
enforceable to the extent provided herein for a period of one year unless
written notice of a breach of a representation or warranty or a claim for
indemnification is received by any party to this Agreement prior to the end of
such one year period, in which event the indemnification responsibility for such
claim shall survive until settled or finally determined. The one year limitation
in this Section shall not apply to Section 4.2 of this Agreement.

         6.4 Expenses. All costs and expenses incurred in connection with this
Agreement and the transactions contemplated hereby shall be paid by the party
incurring such costs or expenses,

                                       6
<PAGE>   7

except as may otherwise be expressly provided in this Agreement. Any costs of
litigation required to enforce this Agreement will be borne by the losing party.

         6.5 Amendments. No amendment to or modification of this Agreement shall
be effective unless it shall be in writing and signed by each of the parties
hereto.

         6.6 Notices. All notices and other communications hereunder shall be in
writing and shall be deemed given (a) on the date of delivery if delivered
personally; (b) on the date of transmission if sent via facsimile transmission
to the facsimile number given below, and telephonic confirmation of receipt is
obtained promptly after completion of transmission; (c) on the date after
delivery to a reputable nationally recognized overnight courier service or (d)
three days after being mailed by registered or certified mail (return receipt
requested) to the parties at the following addresses (or at such other address
for a party as shall be specified by like notice):

                  If to Buyer or the Company:

                  XXI Holding Co., Inc.
                  Suite 500, 607 Market Street
                  Knoxville, TN 37902
                  ATTN:  Tim Williams

                  with copies to:

                  CMH Capital, Inc.
                  5000 Clayton Road
                  Maryville, Tennessee 37804
                  ATTN:  Kevin Clayton

                  and

                  James W. Parris, Esq.
                  Bernstein, Stair & McAdams
                  Suite 600, 530 S. Gay Street
                  Knoxville, Tennessee 37902

                  If to Seller:

                  American Homestar Corporation
                  2450 South Shore Boulevard, Suite 300
                  League City, TX 77573
                  Attention:   Executive Vice President and
                               Chief Financial Officer
                  and
                  American Homestar Corporation
                  2221 E. Lamar Blvd., Suite 790
                  Arlington, TX  76006
                  Attention:  Chief Executive Officer

                                       7
<PAGE>   8

                  with a copy to:

                  Richard F. Dahlson, Esq.
                  Jackson  Walker L.L.P.
                  Suite 6000, 901 Main Street
                  Dallas, TX 75202

Such addresses may be changed from time to time by means of a notice given in
the manner provided in this Section (provided that no such notice shall be
effective until it is received by the other parties hereto).

         6.7 Severability. If any provision of this Agreement or the application
of any such provision to any person or circumstance shall be held invalid,
illegal or unenforceable in any respect by a court of competent jurisdiction,
such invalidity, illegality or unenforceability shall not affect any other
provision hereof.

         6.8 Interpretation. The headings contained in this Agreement are for
reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement. The parties acknowledge and agree that (i)
each party and its counsel have reviewed and negotiated the terms and provisions
of this Agreement and have contributed to its revision, (ii) the normal rule of
construction, to the effect that any ambiguities are resolved against the
drafting party, shall not be employed in the interpretation of it, and (iii) the
terms and provisions of this Agreement shall be constructed fairly as to all
parties hereto and not in favor of or against any party, regardless of which
party was generally responsible for the preparation of this Agreement.

         6.9 Waiver. Waiver of any term or condition of this Agreement by any
party shall be effective if in writing and shall not be construed as a waiver of
any subsequent breach or failure of the same term or condition, or a waiver of
any other term of this Agreement. No failure or delay by any party in exercising
any right, power or privilege hereunder shall operate as a waiver thereof nor
shall any single or partial exercise thereof preclude any other or further
exercise thereof or the exercise of any other right, power or privilege.

         6.10 Counterparts. This Agreement may be executed in any number of
counterparts, all of which shall be considered one and the same agreement, and
shall become effective when one or more such counterparts have been signed by
each of the parties and delivered to the other parties.

         6.11 Entire Agreement. This Agreement, including the Exhibits hereto,
contain the entire agreement and understanding between the parties hereto with
respect to the subject matter hereof and supersede all prior and contemporaneous
agreements, negotiations, correspondence, undertakings and understandings, oral
or written, relating to such subject matter.

         6.12 Public Disclosure of Terms. Buyer and Seller will mutually agree
on a press release announcing this transaction. Thereafter, disclosures will be
made as required by law.

         6.13 Governing Law. This Agreement shall be governed in all respects by
the laws of the State of Delaware.

                                       8
<PAGE>   9

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the date set forth above.

                          AMERICAN HOMESTAR CORPORATION

                          By: /s/ LAURENCE A. DAWSON JR.
                             ---------------------------------------------------
                          Title:  President

                          XXI HOLDING CO., INC.

                          By: /s/ TIM WILLIAMS
                             ---------------------------------------------------
                          Title:  President

                          21st CENTURY MORTGAGE CORPORATION

                          By: /s/ TIM WILLIAMS
                             ---------------------------------------------------
                          Title:  President

                                       9

<PAGE>   10

                                LIST OF EXHIBITS

Exhibit A - Limited Liability Company Agreement

Exhibit B - Revenue Sharing Agreement

Exhibit C - June 2000 Manufactured Home Dealer Agreement

Exhibit D - Amendment to Securityholders Agreement

Exhibit E - Settlement Statement

         Schedule 1 - List of Unpaid obligations of Buyer to Seller

         Schedule 2 - List of Repossessions to be Placed on Repo Line

         Schedule 3 - List of Unpaid Obligations of Seller to Buyer

Exhibit F - Sales and Servicing Agreement

Exhibit G - 1995 Dealer Agreement Repossession Procedures

<PAGE>   11

                                    EXHIBIT E

                              SETTLEMENT STATEMENT
                                     FOR THE
          PURCHASE OF 2,500,000 SHARES OF COMMON STOCK OF 21ST CENTURY
                              MORTGAGE CORPORATION
                                      FROM
                          AMERICAN HOMESTAR CORPORATION
                                       By
                              XXI HOLDING CO., INC.

<TABLE>
<CAPTION>
<S>                                                               <C>
Purchase Price due Seller                                        $ 6,300,000.00
ADJUSTMENTS:

Deduct from Proceeds Due Seller -
         Investment in Homestar 21 JV, LLC                        (2,400,000.00)
         Guaranty Deposit to 21st Century Mortgage
         Corporation in accordance with Section 4.2(b)            (1,000,000.00)

NET PROCEEDS DUE AMERICAN HOMESTAR CORPORATION                    $2,900,000.00
</TABLE>

                                      E-1

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