http://www.anandtech.com/bench/product/702?vs=697
Every game but Diablo 3 the i5 wins. And I don't trust a Biostar mobo.
PCPartPicker part list:
http://pcpartpicker.com/p/1Hsll
Price breakdown by merchant: http://pcpartpicker.com/p/1Hsll/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1Hsll/benchmarks/
CPU: Intel Core i5-3470 3.2GHz Quad-Core Processor ($189.99 @ Newegg)
Motherboard: Asus P8B75-V ATX LGA1155 Motherboard ($89.98 @ Outlet PC)
Memory: Kingston Blu Red Series 8GB (2 x 4GB) DDR3-1333 Memory ($48.96 @ NCIX US)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($58.98 @ Outlet PC)
Video Card: PowerColor Radeon HD 7950 3GB Video Card ($179.99 @ Newegg)
Case: Cooler Master RC-430-KWN6 ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: Corsair CX 500W 80 PLUS Bronze Certified ATX12V Power Supply ($47.99 @ Microcenter)
Optical Drive: LG GH24NS95 DVD/CD Writer ($19.99 @ Newegg)
Total: $657.87
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-25 10:18 EDT-0400)
I feel like that build would beat the 8350 build.