PCPartPicker part list:
http://pcpartpicker.com/p/3t945
Price breakdown by merchant: http://pcpartpicker.com/p/3t945/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3t945/benchmarks/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Amazon)
Motherboard: Asus M5A78L-M LX PLUS Micro ATX AM3+ Motherboard ($50.79 @ Amazon)
Memory: GeIL EVO POTENZA 8GB (2 x 4GB) DDR3-1600 Memory ($63.99 @ Newegg)
Storage: Western Digital Caviar Blue 500GB 3.5" 7200RPM Internal Hard Drive ($51.98 @ OutletPC)
Video Card: Gigabyte GeForce GTX 660 2GB Video Card ($179.99 @ Newegg)
Case: Xigmatek Recon ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: EVGA 600B 600W 80+ Bronze Certified ATX Power Supply ($54.99 @ NCIX US)
Optical Drive: LG GH24NSB0 DVD/CD Writer ($15.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)
Total: $647.68
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-16 23:14 EDT-0400)