PCPartPicker part list:
http://pcpartpicker.com/p/hRRkgs
Price breakdown by merchant: http://pcpartpicker.com/p/hRRkgs/by_merchant/
Benchmarks: http://pcpartpicker.com/p/hRRkgs/benchmarks/
CPU: AMD FX-6350 3.9GHz 6-Core Processor ($139.99 @ Amazon)
Motherboard: Gigabyte GA-990FXA-UD3 ATX AM3+ Motherboard ($125.99 @ Amazon)
Video Card: MSI Radeon R9 280 3GB TWIN FROZR Video Card ($269.99 @ Amazon)
Total: $535.97
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-06-08 09:16 EDT-0400)