PCPartPicker part list:
http://pcpartpicker.com/p/1Xyg1
Price breakdown by merchant: http://pcpartpicker.com/p/1Xyg1/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1Xyg1/benchmarks/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Newegg)
Motherboard: Asus M5A78L-M/USB3 Micro ATX AM3+ Motherboard ($53.98 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($63.75 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Video Card: MSI Radeon HD 7850 2GB Video Card ($109.99 @ Newegg)
Case: Fractal Design Core 1000 USB 3.0 MicroATX Mid Tower Case ($29.99 @ Microcenter)
Power Supply: Corsair Builder 500W 80 PLUS Bronze Certified ATX12V Power Supply ($24.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($14.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($84.99 @ NCIX US)
Total: $552.65
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-04 20:39 EST-0500)