PCPartPicker part list:
http://pcpartpicker.com/p/yvtH7P
Price breakdown by merchant: http://pcpartpicker.com/p/yvtH7P/by_merchant/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($118.98 @ OutletPC)
Motherboard: Gigabyte GA-970A-UD3P ATX AM3+ Motherboard ($73.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1866 Memory ($79.99 @ NCIX US)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($49.99 @ Amazon)
Video Card: XFX Radeon R9 270 2GB Core Edition Video Card ($139.99 @ NCIX US)
Case: Cooler Master N400 ATX Mid Tower Case ($53.99 @ Mwave)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($55.98 @ SuperBiiz)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)
Total: $682.87
Prices include shipping, taxes, and discounts when available
It's a little bit under budget so you that you can get a better looking case thatbfitsbyour style. Also you could spend that money on a CPU cooler so that you can oc. Recommend hyper 212 evo/plus. This will let you run games on high and some ultra