[Android] shimp208:
If your going to buy a pre-built computer with Linux pre-installed your options are limited in regards to what manufactures/boutique builders make desktops and laptops with Linux pre-installed. Here are a couple different configurations I came up with from System76 and ZaReason

Desktops

System76

Wild Dog Performance (wilp9)

Ubuntu 12.10 64 bit

5 Free GB of Ubuntu One Online Storage and Sync

3rd Generation Intel Core i5 3570K ( 3.40GHz - 6MB cache - 4 Cores )

16 GB – 4 x 4 GB - Crucial Sport Dual Channel DDR3

1 GB nVidia GeForce GTX 650

2.0 TB SATA III 6 Gb/s 64 MB Cache

2.0 TB SATA III 6 Gb/s 64 MB Cache

CD-RW / DVD-RW Dual Layer

Internal SD, Memory Stick, Compact Flash Card Reader

Internal PCI Express 802.11 bgn Wifi Card

1 Yr. Ltd. Warranty and 1 Yr. Technical Support

Total Cost: $1350

ZaReason

Limbo 5660

Linux Version:	Ubuntu 12.04 LTS

CPU:	i5-3570K 3.4 GHz

Desktop Memory:	8 GB DDR3-1600

Desktop Hard Drive Bay1:	500GB 7200rpm

Desktop Hard Drive Bay2:	500 GB 7200rpm

Optical Drive:	CD-RW/DVD-RW

Sound Card:	Intel HD Audio

PCI Networking:	Gigabit Ethernet

Video card:	Nvidia GT 630

Power Supply:	350 watts

Warranty:	1 year

Total Cost: $1,100

Laptop

ZaReason

Verix 530

Linux Version:	Ubuntu 12.04 LTS - Most Popular

Ivy Bridge Processor:	i7-3630QM 2.4-3.4 GHz, 4 cores, 8 threads 2.4-3.4 GHz GHz

Laptop Memory:	8 GB DDR3-1600

Video Card:	Nvidia GT 650M 2GB

Laptop HD:	750GB, 7200 RPM

Optical Drive:	CD-RW / DVD-RW

WiFi #ZWF:	Intel® Centrino® Wireless-N

1st Battery:	6-cell

AC Adapters:	1

Card Reader:	MMC/SD/MS

Bluetooth:	Included

Webcam:	1.3 megapixels

Warranty:	1 year

System76

Lemur Ultra (lemu4)

Ubuntu 12.10 64 bit

5 Free GB of Ubuntu One Online Storage and Sync

14.1" 720p High Definition LED Backlit Display ( 1366 x 768 )

Intel HD Graphics 4000

3rd Generation Intel Core i7-3630QM Processor ( 2.40GHz 6MB L3 Cache - 4 Cores plus Hyperthreading )

8 GB Dual Channel DDR3 SDRAM at 1600MHz

750 GB 7200 RPM SATA II

United States Keyboard Layout

8X DVD±R/RW/4X +DL Super-Multi Drive

Intel Centrino Advanced-N 6235 - 802.11A/B/G/N Wireless LAN + Bluetooth Combo Module +$20.00

1 Yr. Ltd. Warranty and 1 Yr. Technical Support

Total Cost: $840

Now if your want to build your own linux desktop here is a recommended configuration:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i7-3770K 3.5GHz Quad-Core Processor ($319.99 @ Newegg)

CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($25.99 @ Newegg)

Motherboard: Asus Maximus V Gene Micro ATX LGA1155 Motherboard ($199.99 @ Newegg)

Memory: Corsair Vengeance LP 32GB (4 x 8GB) DDR3-1600 Memory ($149.99 @ Newegg)

Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($86.98 @ Newegg)

Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($86.98 @ Newegg)

Video Card: Gigabyte GeForce GTX 660 2GB Video Card ($217.55 @ Newegg)

Case: Antec DF-35 ATX Mid Tower Case

Power Supply: Corsair Builder 750W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($73.98 @ Newegg)

Optical Drive: Asus DRW-24B3ST/BLK/G/AS DVD/CD Writer ($29.98 @ Newegg)

Total: $1191.43

(Prices include shipping, taxes, and discounts when available.)

(Generated by PCPartPicker 2012-11-27 17:49 EST-0500)

With Ubuntu 12.04 LTS 64-bit (Make sure to select 64-bit from the download list). Let me know if you have any more questions.