PCPartPicker part list:
http://pcpartpicker.com/p/3hEZA
Price breakdown by merchant: http://pcpartpicker.com/p/3hEZA/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3hEZA/benchmarks/
CPU: AMD Athlon X4 750K 3.4GHz Quad-Core Processor ($79.98 @ OutletPC)
Motherboard: Asus A55BM-E Micro ATX FM2+ Motherboard ($59.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.55 @ Amazon)
Video Card: PowerColor Radeon HD 7770 GHz Edition 1GB Video Card ($102.98 @ Newegg)
Case: NZXT Source 210 (Black) ATX Mid Tower Case ($37.99 @ Micro Center)
Power Supply: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply ($39.99 @ Newegg)
Optical Drive: LG GH24NSB0 DVD/CD Writer ($15.99 @ Micro Center)
Operating System: Microsoft Windows 8.1 - 64-bit (OEM) (64-bit) ($97.26 @ OutletPC)
Total: $493.73
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-27 20:31 EDT-0400)