PCPartPicker part list:
http://pcpartpicker.com/p/2UuvS
Price breakdown by merchant: http://pcpartpicker.com/p/2UuvS/by_merchant/
Benchmarks: http://pcpartpicker.com/p/2UuvS/benchmarks/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Newegg)
Motherboard: ASRock 970 PRO3 R2.0 ATX AM3+ Motherboard ($64.99 @ Newegg)
Memory: A-Data XPG V2 8GB (2 x 4GB) DDR3-1600 Memory ($69.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Video Card: XFX Radeon HD 7770 GHz Edition 1GB Video Card ($89.99 @ NCIX US)
Case: Thermaltake Commander MS/I Snow Edition (White/Black) ATX Mid Tower Case ($34.99 @ Microcenter)
Power Supply: Corsair CX 500W 80+ Bronze Certified Semi-Modular ATX Power Supply ($39.99 @ Newegg)
Optical Drive: LG GH24NSB0 DVD/CD Writer ($15.99 @ Microcenter)
Operating System: Microsoft Windows 8.1 - 64-bit - OEM (64-bit) ($99.97 @ OutletPC)
Total: $585.88