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PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($134.83 @ Amazon)
Motherboard: ASRock 880GM-LE FX Micro ATX AM3+ Motherboard ($54.99 @ Amazon)
Memory: Patriot Gamer 2 Series 8GB (2 x 4GB) DDR3-1600 Memory ($47.98 @ NCIX US)
Storage: Western Digital Caviar Blue 500GB 3.5" 7200RPM Internal Hard Drive ($54.98 @ Outlet PC)
Video Card: Sapphire Radeon HD 7850 1GB Video Card ($149.99 @ Newegg)
Case: Cooler Master Elite 430 ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: Corsair Builder 500W 80 PLUS Bronze Certified ATX12V Power Supply ($49.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($14.99 @ Newegg)
Total: $537.74
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-04-14 16:15 EDT-0400)
 
Solution

AMDRadeonHD

Honorable
Jan 10, 2013
1,087
0
11,660

That one looks amazing, never had an AMD processor before. I had an Intel Pentium E6300 with a Sapphire Radeon HD 4350 and 4GB DDR2 800MHz RAM and it ran Call of Duty: Modern Warfare at 45 frames per second maxed out without AA at 1360x768. Unfortunately, it died.