Try this (No rebates included):
PCPartPicker part list:
http://pcpartpicker.com/p/fQ97Jx
Price breakdown by merchant: http://pcpartpicker.com/p/fQ97Jx/by_merchant/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($94.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 Plus 76.8 CFM Sleeve Bearing CPU Cooler ($25.99 @ SuperBiiz)
Motherboard: Asus M5A99FX PRO R2.0 ATX AM3+ Motherboard ($119.84 @ Amazon)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1866 Memory ($57.89 @ OutletPC)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.99 @ Amazon)
Video Card: Gigabyte Radeon R9 280 3GB WINDFORCE Video Card ($212.98 @ Newegg)
Case: Deepcool TESSERACT BF ATX Mid Tower Case ($37.98 @ Newegg)
Power Supply: EVGA SuperNOVA GS 550W 80+ Gold Certified Fully-Modular ATX Power Supply ($79.99 @ NCIX US)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($18.89 @ OutletPC)
Total: $698.54
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-06-15 17:55 EDT-0400
This build does NOT include the operating system. Compared to the build Jeremyott gave, this one has a better quality power supply (Tier 1) and has a great aftermarket CPU cooler, which is needed for an AMD CPU rig. The AMD FX-8320 is only a teeny bit better than the FX-6300. Both the CPU and GPU are AMD.