PCPartPicker part list:
http://pcpartpicker.com/p/1YPwi
Price breakdown by merchant: http://pcpartpicker.com/p/1YPwi/by_merchant/
CPU: AMD FX-4130 3.8GHz Quad-Core Processor ($89.96 @ Amazon)
Motherboard: MSI 970A-G43 ATX AM3+ Motherboard ($64.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($74.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ NCIX US)
Video Card: MSI Radeon HD 7870 GHz Edition 2GB Video Card ($169.99 @ Newegg)
Case: NZXT Source 210 Elite (White) ATX Mid Tower Case ($42.98 @ Amazon)
Power Supply: Corsair CX 500W 80 PLUS Bronze Certified ATX12V Power Supply ($54.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($14.99 @ Newegg)
Operating System: Microsoft Windows 8.1 - OEM (64-bit) ($98.98 @ OutletPC)
Monitor: AOC i2267Fw 60Hz 22.0" Monitor ($139.99 @ Microcenter)
Total: $796.85
(Prices include shipping, taxes, and discounts when available.)