Document:

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                                                                    EXHIBIT 10.2

                            STOCK PURCHASE AGREEMENT

          THIS STOCK PURCHASE AGREEMENT (this "Agreement") is made as of March
1, 2005, by and among (i) NewQuest Holdings, Inc., a Delaware corporation (the
"Company"), (ii) GTCR Fund VIII, L.P., a Delaware limited partnership ("Fund
VIII"), (iii) GTCR Fund VIII/B, L.P., a Delaware limited partnership ("Fund
VIII/B"), (iv) GTCR Co-Invest II, L.P., a Delaware limited partnership ("GTCR
Co-Invest," and together with Fund VIII, Fund VIII/B and any investment fund
managed by GTCR Golder Rauner II, L.L.C., a Delaware limited liability company
("GTCR") or any of its Affiliates, that at any time acquires securities of the
Company and executes a counterpart of this Agreement or otherwise agrees to be
bound by this Agreement, each a "GTCR Purchaser" and collectively the "GTCR
Purchasers"), and (v) the Persons listed on the Schedule of Purchasers attached
hereto under the heading "Other Purchasers" (collectively, the "Other
Purchasers" and each an "Other Purchaser"). The GTCR Purchasers and the Other
Purchasers are collectively referred to herein as the "Purchasers" and
individually as a "Purchaser." Certain capitalized terms are defined in Section
4 below. Capitalized terms used herein and not otherwise defined shall have the
meanings given to such terms in the Acquisition Agreement (as defined below).

          WHEREAS, pursuant to this Agreement, the Company desires to issue and
sell and the Purchasers desire to purchase an aggregate of 136,071.817 shares of
its Preferred Stock, par value $0.01 per share (the "Preferred Stock"), for an
aggregate purchase price of $136,071,817.00, and an aggregate of 36,475,174
shares of its Common Stock, par value $0.01 per share (the "Common Stock"), for
an aggregate purchase price of $3,647,517.40;

          WHEREAS, pursuant to that certain Purchase and Exchange Agreement,
dated as of November 10, 2004, by and among the Company, NewQuest, Inc., a
Delaware corporation ("Buyer"), NewQuest, LLC, a Texas limited liability company
("Target"), and certain other Persons identified therein, as amended (as such
agreement may be further amended or modified from time to time in accordance
with its terms, the "Acquisition Agreement"), the Company and Buyer will acquire
(the "Acquisition") all of the outstanding equity interests of Target;

          WHEREAS, the Purchasers are purchasing the Preferred Stock and Common
Stock hereunder in order to provide a portion of the financing necessary to
consummate the Acquisition; and

          WHEREAS, the purchase and sale of the Preferred Stock and the Common
Stock contemplated by this Agreement will be consummated contemporaneously with
the consummation of the Acquisition pursuant to the terms of the Acquisition
Agreement.

          NOW, THEREFORE, in consideration of the mutual covenants, agreements
and understandings herein contained, the Purchasers and the Company hereby agree
as follows:

          Section 1. Authorization and Closing.

          1A. Authorization of the Purchaser Stock. The Company shall authorize
the issuance and sale to the Purchasers of 136,071.817 shares of Preferred Stock
and an aggregate of

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36,475,174 shares of Common Stock, each having the rights and preferences set
forth in the Certificate of Incorporation.

          1B. Purchase and Sale of the Purchaser Stock. At the Closing (as
defined in Section 1C below), the Company shall sell to each Purchaser and,
subject to the terms and conditions set forth herein, each Purchaser shall
purchase from the Company the number of shares of Preferred Stock and Common
Stock set forth opposite such Purchaser's name on the Schedule of Purchasers
attached hereto at the price set forth opposite such Purchaser's name on the
Schedule of Purchasers attached hereto. The Preferred Stock and the Common Stock
acquired by the Purchasers hereunder are collectively referred to herein as the
"Purchaser Stock." The sale of the Purchaser Stock to each Purchaser shall
constitute a separate sale hereunder.

          1C. The Closing. The closing of the purchase and sale of the Purchaser
Stock to be purchased pursuant to Section 1B above (the "Closing") shall take
place at the offices of Kirkland & Ellis LLP, 200 East Randolph Drive, Chicago,
Illinois 60601 at 10:00 a.m. on the date hereof. At the Closing, the Company
shall issue stock certificates representing the Purchaser Stock to be purchased
by each Purchaser in the name of such Purchaser, upon payment of the purchase
price thereof by a cashier's or certified check, or by wire transfer of
immediately available funds to such account as designated by the Company, in the
amounts set forth opposite such Purchaser's name on the Schedule of Purchasers
attached hereto. The Company shall deliver to each GTCR Purchaser the stock
certificates evidencing the Purchaser Stock to be purchased by such GTCR
Purchaser. Notwithstanding any provision to the contrary, the Company shall hold
all stock certificates issued in the name of the Other Purchasers as custodian
on their behalf pursuant to the terms of the Stockholders Agreement. At the
Closing, each Purchaser agrees to execute the Stockholders Agreement and the
Registration Agreement.

          Section 2. Transfer of Restricted Securities.

               (i) Restricted Securities are transferable only pursuant to (a)
     Public Offerings, (b) Rule 144 of the Securities and Exchange Commission
     (or any similar rule or rules then in force) if such rule or rules are
     available and (c) subject to the conditions specified in clause (ii) below,
     any other legally available means of transfer.

               (ii) In connection with the transfer of any Restricted Securities
     (other than a transfer described in Sections 2(i)(a) or (b) above), the
     holder thereof shall deliver written notice to the Company describing in
     reasonable detail the transfer or proposed transfer, together with an
     opinion of Kirkland & Ellis LLP or other counsel that (to the Company's
     reasonable satisfaction) is knowledgeable in securities law matters to the
     effect that such transfer of Restricted Securities may be effected without
     registration of such Restricted Securities under the Securities Act. In
     addition, if the holder of the Restricted Securities delivers to the
     Company an opinion of Kirkland & Ellis LLP or other counsel that no
     subsequent transfer of such Restricted Securities shall require
     registration under the Securities Act, the Company shall promptly upon such
     contemplated transfer deliver to the prospective transferor new
     certificates for such Restricted Securities that do not bear the Securities
     Act legend set forth in Section 5C. If the Company is not required to
     deliver new certificates for such Restricted Securities not bearing such
     legend, the holder thereof shall not transfer the same until the
     prospective

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     transferee has confirmed to the Company in writing its agreement to be
     bound by the conditions contained in this Section 2 and Section 5C.

          Section 3. Representations and Warranties of the Company. As a
material inducement to the Purchasers to enter into this Agreement and purchase
the Purchaser Stock, the Company hereby represents and warrants to the
Purchasers that:

          3A. Organization and Corporate Power. The Company has the full power,
authority and legal capacity to enter into this Agreement, the other Transaction
Documents, and the other documents contemplated hereby to which the Company is a
party and to perform its obligations hereunder and thereunder. The Company is a
corporation duly organized, validly existing and in good standing under the laws
of Delaware and is qualified to do business in every jurisdiction in which its
ownership of property or conduct of business requires it to qualify except where
the failure to be so qualified would not have a material adverse effect on the
Company. The Company possesses all requisite corporate power and authority and
all licenses, permits and authorizations necessary to own and operate its
properties, to carry on its businesses as now conducted and presently proposed
to be conducted and to carry out the transactions contemplated by this
Agreement. The copies of the Company's Certificate of Incorporation and bylaws
which have been furnished to the Purchasers' counsel reflect all amendments made
thereto at any time prior to the date of this Agreement and are true and
complete. The minute books (containing the records of meetings of the Board and
stockholders of the Company), the stock certificate books and the stock record
books of the Company are true and complete in all material respects. The Company
is not in default under or in violation of any provision of its Certificate of
Incorporation or bylaws.

          3B. Capital Stock and Related Matters. As of the Closing and
immediately thereafter, the authorized capital stock of the Company shall
consist of (a) 1,000,000 shares of Preferred Stock, 227,153.710 of which shall
be issued and outstanding, and (b) 74,000,000 shares of Common Stock, 63,462,937
of which shall be issued and outstanding and 4,193,104 of which shall be
reserved for issuance upon exercise of stock options to be issued under the
Stock Option Plan. All of the issued and outstanding capital stock of the
Company have been duly authorized, are validly issued, fully paid, and
nonassessable and, except as set forth in the Stockholders Agreement, are not
subject to, nor were they issued in violation of, any preemptive rights or
rights of first refusal. At the Closing, the Company shall sell to the
Purchasers good and marketable title to the Purchaser Stock, free and clear of
all Encumbrances (other than restrictions on transfer under the Securities Act
and applicable state securities laws). Except as set forth on the attached
Capitalization Schedule, the Company does not have outstanding any stock or
securities convertible or exchangeable for any shares of its capital stock or
containing any profit participation features, nor any rights or options to
subscribe for or to purchase its capital stock or any units or securities
convertible into or exchangeable for its capital stock or any stock appreciation
rights or phantom stock plan or agreements. The Company has not violated any
federal or state securities laws in connection with the offer, sale or issuance
of its capital stock. There are no agreements with the Company with respect to
the voting or transfer of the Company's capital stock or with respect to any
other aspect of the Company's affairs, except pursuant to the Stockholders
Agreement.

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          3C. Subsidiaries; Investments. Buyer is the Company's only Subsidiary.
The Company owns 100% of the capital stock of Buyer. Buyer is duly incorporated,
validly existing and in good standing under the laws of Delaware, possesses all
requisite corporate power and authority and all material licenses, permits and
authorizations necessary to own its properties and to carry on its business as
now being conducted and as presently proposed to be conducted and is qualified
to do business in every jurisdiction in which its ownership of property or the
conduct of its business requires it to qualify.

          3D. Authorization; Noncontravention. The execution, delivery and
performance of this Agreement, the other Transaction Documents, and all of the
other agreements and instruments contemplated hereby to which the Company is a
party have been duly authorized by the Company, and no other act or proceeding
on the part of the Company or the Board is necessary to authorize the execution,
delivery or performance of this Agreement, the other Transaction Documents, or
the other agreements contemplated hereby and the consummation of the
transactions contemplated hereby or thereby. This Agreement has been duly
executed and delivered by the Company and constitutes a valid and binding
obligation of the Company, enforceable in accordance with its terms, and each of
the other Transaction Documents and other agreements and instruments
contemplated hereby to which the Company is a party, when executed and delivered
by the Company, in accordance with the terms hereof and thereof, shall each
constitute a valid and binding obligation of the Company, enforceable in
accordance with its respective terms. The execution and delivery by the Company
of this Agreement, the other Transaction Documents, and all of the other
agreements and instruments contemplated hereby to which the Company is a party
and the fulfillment of and compliance with the respective terms hereof and
thereof by the Company do not and shall not (i) conflict with or result in a
breach of the terms, conditions or provisions of, (ii) constitute a default
under (whether with or without the passage of time, the giving of notice or
both), (iii) result in the creation of any Lien upon the Company's or any of its
Subsidiaries' capital stock or equity securities, as applicable, or assets
pursuant to, (iv) give any third party the right to modify, terminate or
accelerate any obligation under (whether or not dependent upon additional
criteria), (v) result in a violation of, or (vi) require any authorization,
consent, approval, exemption or other action of or by or notice or declaration
to, or filing with, any third party or any court or administrative or
governmental body or agency pursuant to the Company's or any of its
Subsidiaries' charter documents, bylaws, operating agreement, including the
Certificate of Incorporation, or other constituent documents, or any law,
statute, rule or regulation to which the Company or any of its Subsidiaries is
subject, or any agreement, instrument, license, permit, order, judgment or
decree to which the Company is subject.

          3E. Conduct of Business; Liabilities. Other than the negotiation,
execution and delivery of this Agreement, the other Transaction Documents and
the other agreements contemplated hereby and thereby, prior to the Closing, the
Company has not (i) conducted any business, (ii) incurred any expenses,
obligations or liabilities (whether accrued, absolute, contingent, unliquidated
or otherwise, whether or not known to the Company and whether due or to become
due and regardless of when asserted), (iii) owned any assets, (iv) entered into
any contracts or agreements, or (v) violated any laws or governmental rules or
regulations.

          Section 4. Definitions. For the purposes of this Agreement, the
following terms have the meanings set forth below:

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          "Affiliate" of any particular Person or entity means any other person
or entity controlling, controlled by or under common control with such
particular person or entity; it being understood and agreed that GTCR Golder
Rauner II, L.L.C. and its Affiliates shall for all purposes hereunder be
Affiliates of GTCR. For purposes of this Agreement, all holdings of Common Stock
and Preferred Stock by Persons who are Affiliates of each other shall be
aggregated for purposes of meeting any threshold tests under this Agreement.

          "Board" means the Company's Board of Directors.

          "Common Stock" means the Common Stock, par value $0.01 per share, of
the Company.

          "Majority Holders" means the holders of a majority of the Purchaser
Preferred or, if no Purchaser Preferred is outstanding, the holders of a
majority of the Purchaser Common.

          "Person" means an individual, a partnership, a corporation, a limited
liability company, an association, a joint stock company, a trust, a joint
venture, an unincorporated organization and a governmental entity or any
department, agency or political subdivision thereof.

          "Preferred Stock" means the Company's Preferred Stock, par value $.01
per share.

          "Public Offering" means any offering by the Corporation of its capital
stock or equity securities to the public pursuant to an effective registration
statement under the Securities Act.

          "Purchaser Common" means (i) the Common Stock issued hereunder and
(ii) any Common Stock issued or issuable with respect to the Common Stock
referred to in clause (i) above by way of stock dividends or stock splits or in
connection with a combination of shares, recapitalization, merger, consolidation
or other reorganization. As to any particular shares of Purchaser Common, such
shares shall cease to be Purchaser Common when they have been (a) effectively
registered under the Securities Act and disposed of in accordance with the
registration statement covering them or (b) distributed to the public through a
broker, dealer or market maker pursuant to Rule 144 under the Securities Act (or
any similar rule then in force).

          "Purchaser Majority" means those Purchasers that upon the consummation
of the transactions contemplated by this Agreement will own a majority of the
shares of Common Stock issued hereunder.

          "Purchaser Preferred" means (i) the Preferred Stock issued hereunder
and (ii) any Preferred Stock issued or issuable with respect to the Preferred
Stock referred to in clause (i) above by way of stock dividends or stock splits
or in connection with a combination of shares, recapitalization, merger,
consolidation or other reorganization. As to any particular shares of Purchaser
Preferred, such shares shall cease to be Purchaser Preferred when they have been
(a) effectively registered under the Securities Act and disposed of in
accordance with the registration statement covering them or (b) distributed to
the public through a broker, dealer or market maker pursuant to Rule 144 under
the Securities Act (or any similar rule then in force).

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          "Purchaser Stock" means the Purchaser Preferred and the Purchaser
Common.

          "Registration Agreement" means that certain Registration Agreement
dated as of the date hereof among the Company, the Purchasers and certain other
Persons identified therein in the form of Exhibit C attached hereto.

          "Restricted Securities" means (i) the Purchaser Stock issued hereunder
and (ii) any securities issued with respect to the securities referred to in
clause (i) above by way of a stock dividend or stock split or in connection with
a combination of shares, recapitalization, merger, consolidation or other
reorganization. As to any particular Restricted Securities, such securities
shall cease to be Restricted Securities when they have (a) been effectively
registered under the Securities Act and disposed of in accordance with the
registration statement covering them, (b) become eligible for sale pursuant to
Rule 144(k) (or any similar provision then in force) under the Securities Act or
(c) been otherwise transferred and new certificates for them not bearing the
Securities Act legend set forth in Section 5C have been delivered by the Company
in accordance with Section 2(ii). Whenever any particular securities cease to be
Restricted Securities, the holder thereof shall be entitled to receive from the
Company, without expense, new securities of like tenor not bearing a Securities
Act legend of the character set forth in Section 5C.

          "Securities Act" means the Securities Act of 1933, as amended, or any
similar federal law then in force.

          "Securities Exchange Act" means the Securities Exchange Act of 1934,
as amended, or any similar federal law then in force.

          "Securities and Exchange Commission" includes any governmental body or
agency succeeding to the functions thereof.

          "Stock Option Plan" means the 2005 Stock Option Plan of the Company.

          "Stockholders Agreement" means that certain Stockholders Agreement
dated as of the date hereof among the Company, the Purchasers and certain other
Persons identified therein in the form of Exhibit B attached hereto.

          "Subsidiary" means, with respect to any Person, any corporation,
limited liability company, partnership, association or other business entity of
which (i) if a corporation, a majority of the total voting power of shares of
stock entitled (without regard to the occurrence of any contingency) to vote in
the election of directors, managers or trustees thereof is at the time owned or
controlled, directly or indirectly, by that Person or one or more of the other
Subsidiaries of that Person or a combination thereof, or (ii) if a limited
liability company, partnership, association or other business entity, a majority
of the partnership or other similar ownership interest thereof is at the time
owned or controlled, directly or indirectly, by any Person or one or more
Subsidiaries of that Person or a combination thereof. For purposes hereof, a
Person or Persons shall be deemed to have a majority ownership interest in a
limited liability company, partnership, association or other business entity if
such Person or Persons shall be allocated a majority of limited liability
company, partnership, association or other business entity

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gains or losses or shall be or control any managing director or general partner
of such limited liability company, partnership, association or other business
entity.

          "Transaction Documents" means this Agreement and all other agreements
executed and delivered by Holdings or Buyer pursuant to this Agreement or in any
instrument, certificate or document delivered by any such Person pursuant to
this Agreement or any other Transaction Document, including the Acquisition
Agreement, the Stockholders Agreement and the Registration Agreement.

          Section 5. Miscellaneous.

          5A. Expenses. The Company agrees to pay, and hold the GTCR Purchasers
and their Affiliates harmless against liability for the payment of, (i) the
reasonable out-of-pocket expenses of the GTCR Purchasers arising in connection
with the negotiation and execution of this Agreement and the consummation of the
transactions contemplated by this Agreement and the Transaction Documents, (ii)
the reasonable fees and expenses of the GTCR Purchasers' counsel arising in
connection with the negotiation and execution of this Agreement and the
consummation of the transactions contemplated by this Agreement and the
Transaction Documents, (iii) the fees and expenses incurred by the GTCR
Purchasers with respect to any amendments or waivers (whether or not the same
become effective) under or in respect of this Agreement, the other Transaction
Documents, the other agreements contemplated hereby and the Certificate of
Incorporation, (iv) stamp and other taxes which may be payable in respect of the
execution and delivery of this Agreement or the issuance, delivery or
acquisition of any shares of Purchaser Stock purchased hereunder, and (v) such
reasonable travel expenses, legal fees and other out-of-pocket fees and expenses
as have been or may be incurred by the GTCR Purchasers, their Affiliates and
their Affiliates' directors, officers and employees in connection with the
rendering of any other services by a GTCR Purchaser or its Affiliates
(including, but not limited to, fees and expenses incurred in attending board of
directors or other Company-related meetings) (without duplication of any
reimbursements pursuant to any professional services agreement between the
Company and any of the GTCR Purchasers). Except as set forth herein, each of the
Other Purchasers shall pay all of its own costs and expenses in connection with
the negotiation and execution of this Agreement, the performance of its
obligations hereunder and the consummation of the transactions contemplated
hereby.

          5B. Remedies. Each holder of Purchaser Stock shall have all rights and
remedies set forth in this Agreement, each of the other Transaction Documents,
the Certificate of Incorporation, and the Company's bylaws and all rights and
remedies which such holders have been granted at any time under any other
agreement or contract and all of the rights which such holders have under any
law. Any Person having any rights under any provision of this Agreement shall be
entitled to enforce such rights specifically (without posting a bond or other
security), to recover damages by reason of any breach of any provision of this
Agreement and to exercise all other rights granted by law.

          5C. Each Purchaser's Investment Representations; Legends. Each
Purchaser hereby represents (i) that such Purchaser acknowledges and understands
that the shares of Restricted Securities are characterized as "restricted
securities" under the federal securities laws inasmuch as they are being
acquired from the Company in a transaction not involving a public

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offering, and such securities may be resold without registration under the
Securities Act only in certain limited circumstances, (ii) that such Purchaser
is familiar with Rule 144, as presently in effect, and understands the resale
limitations imposed thereby and by the Securities Act, (iii) that such Purchaser
is acquiring the Restricted Securities purchased hereunder or acquired pursuant
hereto for its own account with the present intention of holding such securities
for purposes of investment, and that it has no intention of selling such
securities in a public distribution in violation of the federal securities laws
or any applicable state securities laws, (iv) that such Purchaser is an
"accredited investor" as defined in Rule 501(a) under the Securities Act and a
sophisticated investor for purposes of applicable U.S. federal and state
securities laws and regulations, (v) that the Restricted Securities were not
offered to such Purchaser by any means of general solicitation or general
advertising, (vi) that such Purchaser believes that it has such knowledge and
experience in financial and business matters that such Purchaser is capable of
evaluating the merits and risks of an investment in the Company, (vii) that such
Purchaser is able to bear the economic risks of an investment in the Restricted
Securities and could afford a complete loss of such investment, (viii) that this
Agreement and each of the other agreements contemplated hereby constitutes (or
will constitute) the legal, valid and binding obligation of such Purchaser,
enforceable in accordance with its terms and (ix) that the execution, delivery
and performance of this Agreement and such other agreements by such Purchaser
does not and will not conflict with, violate or cause a breach of any agreement,
contract or instrument to which such Purchaser is subject. Without limiting the
foregoing, each of the Other Purchasers has delivered to the Company a true,
accurate and complete Investor Qualification Statement attached hereto as
Exhibit A. Each of the Other Purchasers hereby represents and warrants that the
Investor Qualification Statement is true and correct in all respects on the date
hereof as though executed as of the date hereof.

Notwithstanding the foregoing, nothing contained herein shall prevent any
Purchaser and subsequent holders of Restricted Securities from transferring such
securities in compliance with the provisions of Section 2 hereof and the
Stockholders Agreement. Each certificate for Restricted Securities shall be
imprinted with a legend in substantially the following form:

          "THE SECURITIES REPRESENTED BY THIS CERTIFICATE WERE ORIGINALLY ISSUED
          ON MARCH 1, 2005 AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT
          OF 1933, AS AMENDED. THE TRANSFER OF THE SECURITIES REPRESENTED BY
          THIS CERTIFICATE IS SUBJECT TO THE CONDITIONS SPECIFIED IN THE STOCK
          PURCHASE AGREEMENT, DATED AS OF MARCH 1, 2005 BY AND AMONG THE ISSUER
          (THE "COMPANY") AND CERTAIN PURCHASERS, AND THE COMPANY RESERVES THE
          RIGHT TO REFUSE THE TRANSFER OF SUCH SECURITIES UNTIL SUCH CONDITIONS
          HAVE BEEN FULFILLED WITH RESPECT TO SUCH TRANSFER. A COPY OF SUCH
          CONDITIONS SHALL BE FURNISHED BY THE COMPANY TO THE HOLDER HEREOF UPON
          WRITTEN REQUEST AND WITHOUT CHARGE."

          5D. Consent to Amendments. Except as otherwise expressly provided
herein, the provisions of this Agreement may be amended and the Company may take
any action herein

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prohibited, or omit to perform any act herein required to be performed by it,
only if the Company has obtained the written consent of the Majority Holders. No
other course of dealing between the Company and the holder of any Preferred
Stock or Common Stock or any delay in exercising any rights hereunder or under
the Certificate of Incorporation shall operate as a waiver of any rights of any
such holders. For purposes of this Agreement, shares of Preferred Stock or
Common Stock held by the Company or any of its Subsidiaries shall not be deemed
to be outstanding.

          5E. Survival of Representations and Warranties. All representations
and warranties contained herein or made in writing by any party in connection
herewith shall survive the execution and delivery of this Agreement and the
consummation of the transactions contemplated hereby, regardless of any
investigation made by any Purchaser or on its behalf.

          5F. Successors and Assigns. Except as otherwise expressly provided
herein, all covenants and agreements contained in this Agreement (including the
share purchase and ownership percentage of each Purchaser set forth on the
signature pages attached hereto) by or on behalf of any of the parties hereto
shall bind and inure to the benefit of the respective successors and permitted
assigns of the parties hereto whether so expressed or not. In addition, and
whether or not any express assignment has been made, the provisions of this
Agreement that are for the Purchasers' benefit as a purchaser or holder of
Purchaser Stock are also for the benefit of, and enforceable by, any subsequent
permitted holder of such Purchaser Stock. The rights and obligations of each
GTCR Purchaser under this Agreement may be assigned by such GTCR Purchaser at
any time, in whole or in part, to any investment fund managed by GTCR Golder
Rauner, L.L.C., GTCR Golder Rauner II, L.L.C., or any successor thereto. If a
GTCR Purchaser assigns its rights and obligations, or a portion thereof,
pursuant to this Section 5F, the share purchase and ownership percentage of such
GTCR Purchaser set forth on the signature pages attached hereto shall be
adjusted to reflect such assignment.

          5G. Severability. Whenever possible, each provision of this Agreement
shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be invalid,
illegal or unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability will not affect
any other provision or any other jurisdiction, but this Agreement will be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision had never been contained herein.

          5H. Counterparts. This Agreement may be executed simultaneously in two
or more counterparts, any one of which need not contain the signatures of more
than one party, but all such counterparts taken together shall constitute one
and the same Agreement.

          5I. Delivery by Facsimile. This Agreement, the agreements referred to
herein, and each other agreement or instrument entered into in connection
herewith or therewith or contemplated hereby or thereby, and any amendments
hereto or thereto, to the extent signed and delivered by means of a facsimile
machine, shall be treated in all manner and respects as an original agreement or
instrument and shall be considered to have the same binding legal effect as if
it were the original signed version thereof delivered in person. At the request
of any party hereto or to any such agreement or instrument, each other party
hereto or thereto shall reexecute

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original forms thereof and deliver them to all other parties. No party hereto or
to any such agreement or instrument shall raise the use of a facsimile machine
to deliver a signature or the fact that any signature or agreement or instrument
was transmitted or communicated through the use of a facsimile machine as a
defense to the formation or enforceability of a contract and each such party
forever waives any such defense.

          5J. Entire Agreement. This Agreement, the Transaction Documents and
those other documents expressly referred to herein and other documents of even
date herewith embody the complete agreement among the parties and supersede and
preempt any prior understandings, agreements or representations by or among the
parties, written or oral, which may have related to the subject matter hereof in
any way.

          5K. Descriptive Headings; Interpretation. The descriptive headings of
this Agreement are inserted for convenience only and do not constitute a section
of this Agreement. The use of the word "including" in this Agreement shall be by
way of example rather than by limitation.

          5L. Governing Law. All issues and questions concerning the
construction, validity, enforcement and interpretation of this Agreement and the
exhibits and schedules hereto shall be governed by, and construed in accordance
with, the laws of the State of Delaware, without giving effect to any choice of
law or conflict of law rules or provisions (whether of the State of Delaware or
any other jurisdiction) that would cause the application of the laws of any
jurisdiction other than the State of Delaware.

          5M. No Strict Construction. The parties hereto have participated
jointly in the negotiation and drafting of this Agreement. In the event an
ambiguity or question of intent or interpretation arises, this Agreement shall
be construed as if drafted jointly by the parties hereto, and no presumption or
burden of proof shall arise favoring or disfavoring any party by virtue of the
authoriship of any of the provisions of this Agreement.

          5N. MUTUAL WAIVER OF JURY TRIAL. BECAUSE DISPUTES ARISING IN
CONNECTION WITH COMPLEX TRANSACTIONS ARE MOST QUICKLY AND ECONOMICALLY RESOLVED
BY AN EXPERIENCED AND EXPERT PERSON AND THE PARTIES WISH APPLICABLE STATE AND
FEDERAL LAWS TO APPLY (RATHER THAN ARBITRATION RULES), THE PARTIES DESIRE THAT
THEIR DISPUTES BE RESOLVED BY A JUDGE APPLYING SUCH APPLICABLE LAWS. THEREFORE,
TO ACHIEVE THE BEST COMBINATION OF THE BENEFITS OF THE JUDICIAL SYSTEM AND OF
ARBITRATION, EACH PARTY TO THIS AGREEMENT HEREBY WAIVES ALL RIGHTS TO TRIAL BY
JURY IN ANY ACTION, SUIT, OR PROCEEDING BROUGHT TO RESOLVE ANY DISPUTE BETWEEN
OR AMONG ANY OF THE PARTIES HERETO, WHETHER ARISING IN CONTRACT, TORT OR
OTHERWISE, ARISING OUT OF, CONNECTED WITH, RELATED OR INCIDENTAL TO THIS
AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

          5O. Understanding Among the Purchasers. The determination of each
Purchaser to purchase the Purchaser Stock pursuant to this Agreement has been
made by such Purchaser independent of any other Purchaser and independent of any
statements or opinions as to the advisability of such purchase or as to the
properties, business, prospects or condition (financial or otherwise) of the
Company and its Subsidiaries which may have been made or

                                      -10-

<PAGE>

given by any other Purchaser or by any agent or employee of any other Purchaser.
In addition, it is acknowledged by each of the Other Purchasers that the GTCR
Purchasers have not acted as an agent of such Other Purchaser in connection with
making its investment hereunder and that the GTCR Purchasers shall not be acting
as an agent of such Other Purchasers in connection with monitoring its
investment hereunder. Further, each Other Purchaser acknowledges that Kirkland &
Ellis LLP has not acted and will not act as its counsel in connection with such
matters.

          5P. Notices. All notices, demands or other communications to be given
or delivered under or by reason of the provisions of this Agreement shall be in
writing and shall be deemed to have been given when (i) delivered personally to
the recipient, (ii) sent to the recipient by reputable express courier service
(charges prepaid), (iii) mailed to the recipient by certified or registered
mail, return receipt requested and postage prepaid or (iv) telecopied to the
recipient (with hard copy sent to the recipient by reputable overnight courier
service (charges prepaid) that same day) if telecopied before 5:00 p.m. Chicago,
Illinois time on a business day, and otherwise on the next business day. Such
notices, demands and other communications shall be sent to the Purchasers at the
address(es) indicated on the Schedules of Purchasers attached hereto and to the
Company at the addresses indicated below (or at such other address as shall be
given in writing by one party to the others):

          If to the Company:

          NewQuest Holdings, Inc.
          c/o NewQuest, LLC
          44 Vantage Way
          Suite 300
          Nashville, Tennessee 37228
          Attention: Mr. Herb Fritch
          Telecopy: (615) 291-7011

          with copies to:

          GTCR Fund VIII, L.P., GTCR Fund VIII/B, L.P. and
          GTCR Co-Invest II, L.P.
          c/o GTCR Golder Rauner II, L.L.C.
          6100 Sears Tower
          Chicago, Illinois 60606-6402
          Attention: Edgar D. Jannotta, Jr.
                     Peter M. Stavros
          Telephone: (312) 382-2200
          Facsimile: (312) 382-2201

                                      -11-

<PAGE>

          Kirkland & Ellis LLP
          200 East Randolph Drive
          Chicago, Illinois  60601
          Attention: Kevin R. Evanich, P.C.
                     Jeffrey A. Fine, Esq.
          Telephone: (312) 861-2000
          Facsimile: (312) 861-2200

or to such other address or to the attention of such other person as the
recipient party has specified by prior written notice to the sending party.

                                    * * * * *

                                      -12-

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed this Purchase
Agreement on the date first written above.

                                        NEWQUEST HOLDINGS, INC.

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Its:
                                             -----------------------------------

                                        GTCR FUND VIII, L.P.

                                        By: GTCR Partners VIII, L.P.
                                        Its: General Partner

                                        By: GTCR Golder Rauner II, L.L.C.
                                        Its: General Partner

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Its: Principal

                                        GTCR FUND VIII/B, L.P.

                                        By: GTCR Partners VIII, L.P.
                                        Its: General Partner

                                        By: GTCR Golder Rauner II, L.L.C.
                                        Its: General Partner

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Its: Principal

                                        GTCR CO-INVEST II, L.P.

                                        By: GTCR Golder Rauner II, L.L.C.
                                        Its: General Partner

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Its: Principal<PAGE>
                                                                    EXHIBIT 10.3

                         PROFESSIONAL SERVICES AGREEMENT

          THIS PROFESSIONAL SERVICES AGREEMENT (this "Agreement") is made as of
March 1, 2005, among GTCR Golder Rauner II, L.L.C., a Delaware limited liability
company ("GTCR"), NewQuest Holdings, Inc., a Delaware corporation (the
"Company"), and NewQuest, Inc., a Delaware corporation and wholly owned
subsidiary of the Company ("NewQuest Inc.").

          WHEREAS, GTCR (together with any investment fund or special investment
vehicle controlled by GTCR or GTCR Golder Rauner II, L.L.C., a Delaware limited
liability company, the "Investors") will purchase Preferred Stock, par value
$0.01 per share ("Preferred Stock"), of the Company and Common Stock, par value
$0.01 per share ("Common Stock"), of the Company pursuant to that certain Stock
Purchase Agreement of even date herewith between the Company and the Investors
(the "Purchase Agreement");

          WHEREAS, the Company and NewQuest Inc. desire to receive financial and
management consulting services from GTCR, and obtain the benefit of the
experience of GTCR in business and financial management generally and its
knowledge of the Company and the Company's financial affairs in particular; and

          WHEREAS, GTCR is willing to provide financial and management
consulting services to the Company and NewQuest Inc. and the compensation
arrangements set forth in this Agreement are designed to compensate GTCR for
such services.

          NOW, THEREFORE, in consideration of the foregoing premises and the
respective agreements hereinafter set forth and the mutual benefits to be
derived herefrom, GTCR, the Company and NewQuest Inc. hereby agree as follows:

          1. Engagement. The Company and NewQuest Inc. hereby engage GTCR as a
financial and management consultant, and GTCR hereby agrees to provide financial
and management consulting services to the Company and NewQuest Inc., all on the
terms and subject to the conditions set forth below.

          2. Services of GTCR. GTCR hereby agrees during the term of this
engagement to consult with the board of directors of the Company (the "Board"),
the boards of directors (or similar governing body) of NewQuest Inc. and the
Company's other affiliates and the management of the Company and its affiliates
in such manner and on such business and financial matters as may be reasonably
requested from time to time by the Board, including, but not limited to:

          (a)  corporate strategy;

          (b)  budgeting of future corporate investments;

          (c)  acquisition and divestiture strategies; and

          (d)  debt and equity financings.

<PAGE>

          3. Personnel. GTCR shall provide and devote to the performance of this
Agreement such partners, employees and agents of GTCR as GTCR shall deem
appropriate for the furnishing of the services required thereby.

          4. Placement Fee. Subject to the terms of the Credit Agreement (as
hereinafter defined), at the time of any purchase of equity by the GTCR
Purchasers (as defined in the Purchase Agreement) and/or their affiliates
pursuant to Section 1B of the Purchase Agreement, the Company and NewQuest Inc.,
jointly and severally, shall pay to GTCR a placement fee in immediately
available funds in an amount equal to one percent (1%) of the amount paid to the
Company in connection with such purchase. For purposes of this Agreement, the
"Credit Agreement" means that certain Credit Agreement, dated as of the date
hereof, by and among the Company, NewQuest Inc., the subsidiary guarantors party
thereto, the lenders party thereto, UBS Securities LLC, UBS Loan Finance LLC,
UBS AG, Stamford Branch, and certain other parties thereto.

          5. Management Fee. Commencing as of the date hereof and subject to the
terms of the Credit Agreement, the Company and NewQuest Inc., jointly and
severally, shall pay to GTCR an annual management fee equal to $500,000, payable
in equal monthly installments beginning on the first day of each month.

          6. Expenses. Subject to the terms of the Credit Agreement, the Company
and NewQuest Inc., jointly and severally, shall promptly reimburse GTCR for such
reasonable travel expenses, legal fees and other out-of-pocket fees and expenses
as have been or may be incurred by GTCR, its directors, officers and employees
in connection with the Closing (as defined in the Purchase Agreement), in
connection with rendering any services hereunder (including, but not limited to,
fees and expenses incurred in attending Company-related meetings).

          7. Term. This Agreement will continue from the date hereof until the
Investors and their affiliates cease to own at least 20% of the Preferred Stock
or at least 20% of the Common Stock acquired by the Investors pursuant to the
Purchase Agreement. No termination of this Agreement, whether pursuant to this
paragraph or otherwise, shall affect the Company's or NewQuest Inc.'s
obligations with respect to the fees, costs and expenses incurred by GTCR in
rendering services hereunder and not reimbursed by the Company or NewQuest Inc.
as of the effective date of such termination.

          8. Liability. Neither GTCR nor any of its affiliates, partners,
employees or agents shall be liable to the Company or its subsidiaries or
affiliates for any loss, liability, damage or expense arising out of or in
connection with the performance of services contemplated by this Agreement,
unless such loss, liability, damage or expense shall be proven to result
directly from the gross negligence, willful misconduct or fraud of GTCR.

          9. Indemnification. The Company and NewQuest Inc., jointly and
severally, agree to indemnify and hold harmless GTCR, its partners, affiliates,
officers, agents and employees against and from any and all loss, liability,
suits, claims, costs, damages and expenses (including reasonable attorneys'
fees) arising from their performance hereunder, except as a result of their
gross negligence, intentional wrongdoing or fraud.

                                       -2-

<PAGE>

          10. GTCR an Independent Contractor. GTCR, the Company and NewQuest
Inc. agree that GTCR shall perform services hereunder as an independent
contractor, retaining control over and responsibility for its own operations and
personnel. Neither GTCR nor its directors, officers, or employees shall be
considered employees or agents of the Company or NewQuest Inc. as a result of
this Agreement nor shall any of them have authority to contract in the name of
or bind the Company or NewQuest Inc., except as expressly agreed to in writing
by the Company.

          11. Notices. All notices, demands or other communications to be given
or delivered under or by reason of the provisions of this Agreement shall be in
writing and shall be deemed to have been given when (i) delivered personally to
the recipient, (ii) sent to the recipient by reputable express courier service
(charges prepaid), (iii) mailed to the recipient by certified or registered
mail, return receipt requested and postage prepaid, or (iv) telecopied to the
recipient (with hard copy sent to the recipient by reputable overnight courier
service (charges prepaid) that same day) if telecopied before 5:00 p.m. Chicago,
Illinois time on a business day, and otherwise on the next business day. Such
notices, demands and other communications shall be sent to the Investors and to
the Company and NewQuest Inc. at the addresses indicated below (or at such other
address as shall be given in writing by one party to the others):

          If to GTCR:

             GTCR Golder Rauner II, L.L.C.
             6100 Sears Tower
             Chicago, Illinois 60606-6402
             Attention: Edgar D. Jannotta, Jr.
                        Peter M. Stavros
             Telephone: (312) 382-2200
             Facsimile: (312) 382-2201

             with copies to:

             Kirkland & Ellis LLP
             200 East Randolph Drive
             Chicago, Illinois 60601
             Attention: Kevin R. Evanich, P.C.
                        Jeffrey A. Fine, Esq.
             Telephone: (312) 861-2000
             Facsimile: (312) 861-2200

          If to the Company or NewQuest Inc.:

             NewQuest Holdings, Inc.
             44 Vantage Way
             Suite 300
             Nashville, Tennessee 37228

                                       -3-

<PAGE>

             Attention: Mr. Herb Fritch
             Telecopy: (615) 291-7011

             with copies to:

             GTCR Golder Rauner II, L.L.C.
             6100 Sears Tower
             Chicago, Illinois 60606-6402
             Attention: Edgar D. Jannotta, Jr.
                        Peter M. Stavros
             Telephone: (312) 382-2200
             Facsimile: (312) 382-2201

             Kirkland & Ellis LLP
             200 East Randolph Drive
             Chicago, Illinois 60601
             Attention: Kevin R. Evanich, P.C.
                        Jeffrey A. Fine, Esq.
             Telephone: (312) 861-2000
             Facsimile: (312) 861-2200

          12. Entire Agreement; Modification. This Agreement, those documents
expressly referred to herein and other documents of even date herewith (a)
contain the complete and entire understanding and agreement of GTCR, the Company
and NewQuest Inc. with respect to the subject matter hereof and (b) supersede
all prior and contemporaneous understandings, conditions and agreements, oral or
written, express or implied, respecting the engagement of GTCR in connection
with the subject matter hereof. The provisions of this Agreement may be amended,
modified and/or waived only with the prior written consent of the Company and
GTCR.

          13. Waiver of Breach. The waiver by either party of a breach of any
provision of this Agreement by the other party shall not operate or be construed
as a waiver of any subsequent breach of that provision or any other provision
hereof.

          14. Assignment. GTCR may not assign its rights or obligations under
this Agreement without the express written consent of the Company, except that
GTCR may assign its rights and obligations to an affiliate of GTCR (which shall
include GTCR Golder Rauner, L.L.C.). Neither the Company nor NewQuest Inc. may
assign its rights or obligations under this Agreement without the express
written consent of GTCR.

          15. Successors. This Agreement and all the obligations and benefits
hereunder shall inure to the successors and permitted assigns of the parties.

          16. Counterparts. This Agreement may be executed and delivered by each
party hereto in separate counterparts (including by means of facsimile), each of
which when so executed and delivered shall be deemed an original and both of
which taken together shall constitute one and the same agreement.

                                       -4-

<PAGE>

          17. Choice of Law. This Agreement shall be governed by and construed
in accordance with the domestic laws of the State of Delaware, without giving
effect to any choice of law or conflict of law provision or rule (whether of the
State of Delaware or any other jurisdiction) that would cause the application of
the laws of any jurisdiction other than the State of Delaware.

          18. MUTUAL WAIVER OF JURY TRIAL. BECAUSE DISPUTES ARISING IN
CONNECTION WITH COMPLEX TRANSACTIONS ARE MOST QUICKLY AND ECONOMICALLY RESOLVED
BY AN EXPERIENCED AND EXPERT PERSON AND THE PARTIES WISH APPLICABLE STATE AND
FEDERAL LAWS TO APPLY (RATHER THAN ARBITRATION RULES), THE PARTIES DESIRE THAT
THEIR DISPUTES BE RESOLVED BY A JUDGE APPLYING SUCH APPLICABLE LAWS. THEREFORE,
TO ACHIEVE THE BEST COMBINATION OF THE BENEFITS OF THE JUDICIAL SYSTEM AND OF
ARBITRATION, EACH PARTY TO THIS AGREEMENT HEREBY WAIVES ALL RIGHTS TO TRIAL BY
JURY IN ANY ACTION, SUIT, OR PROCEEDING BROUGHT TO RESOLVE ANY DISPUTE BETWEEN
THE PARTIES HERETO, WHETHER ARISING IN CONTRACT, TORT, OR OTHERWISE, ARISING OUT
OF, CONNECTED WITH, RELATED OR INCIDENTAL TO THIS AGREEMENT AND/OR THE
TRANSACTIONS CONTEMPLATED HEREBY.

          19. No Strict Construction. The parties hereto have participated
jointly in the negotiation and drafting of this Agreement. In the event an
ambiguity or question of intent or interpretation arises, this Agreement shall
be construed as if drafted jointly by the parties hereto, and no presumption or
burden of proof shall arise favoring or disfavoring any party by virtue of the
authorship of any of the provisions of this Agreement.

          20. Descriptive Headings; Interpretation. The descriptive headings of
this Agreement are inserted for convenience only and do not constitute a
substantive part of this Agreement. Whenever required by the context, any
pronoun used in this Agreement shall include the corresponding masculine,
feminine, or neuter forms, and the singular form of nouns, pronouns, and verbs
shall include the plural and vice versa. The use of the word "including" in this
Agreement shall be, in each case, by way of example and without limitation. The
use of the words "or," "either," and "any" shall not be exclusive. Reference to
any agreement, document, or instrument means such agreement, document, or
instrument as amended or otherwise modified from time to time in accordance with
the terms thereof, and, if applicable, hereof.

                                    * * * * *

                                       -5-

<PAGE>

          IN WITNESS WHEREOF, the undersigned have caused this Professional
Services Agreement to be duly executed and delivered on the date and year first
above written.

                                        GTCR GOLDER RAUNER II, L.L.C.

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Its: Principal

                                        NEWQUEST HOLDINGS, INC.

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Its:
                                             -----------------------------------

                                        NEWQUEST, INC.

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Its:
                                             -----------------------------------

                SIGNATURE PAGE TO PROFESSIONAL SERVICES AGREEMENT

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