PCPartPicker part list:
http://pcpartpicker.com/p/3npoQ
Price breakdown by merchant: http://pcpartpicker.com/p/3npoQ/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3npoQ/benchmarks/
CPU: AMD FX-8320 3.5GHz 8-Core Processor ($151.99 @ Amazon)
Motherboard: Asus M5A99FX PRO R2.0 ATX AM3+ Motherboard ($135.98 @ Best Buy)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1600 Memory ($63.99 @ Newegg)
Storage: Seagate 1TB 3.5" 7200RPM Hybrid Internal Hard Drive ($83.24 @ Amazon)
Video Card: PNY GeForce GTX 770 2GB Video Card ($310.49 @ Amazon)
Case: Cooler Master HAF 922 (Black) ATX Mid Tower Case ($99.99 @ Amazon)
Power Supply: Corsair Builder 500W 80+ Bronze Certified ATX Power Supply ($49.99 @ Newegg)
Total: $895.67
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-07 01:10 EDT-0400)
Better bang for the buck option Keep what you have though because it's an excellent build.