This is what I came up with. I did this pretty quickly so make sure to do your research on each part to get the best bang for your buck.
PCPartPicker part list:
http://pcpartpicker.com/p/1x6c5
Price breakdown by merchant: http://pcpartpicker.com/p/1x6c5/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1x6c5/benchmarks/
CPU: Intel Core i5-3570 3.4GHz Quad-Core Processor ($207.38 @ Amazon)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.99 @ Microcenter)
Motherboard: Gigabyte GA-Z77X-D3H ATX LGA1155 Motherboard ($123.98 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1866 Memory ($58.65 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ Outlet PC)
Video Card: EVGA GeForce GTX 660 2GB Video Card ($194.99 @ Microcenter)
Case: Thermaltake Commander MS/I Snow Edition (White/Black) ATX Mid Tower Case ($31.99 @ Microcenter)
Power Supply: Corsair CX 600W 80 PLUS Bronze Certified ATX12V Power Supply ($49.99 @ NCIX US)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($14.98 @ Outlet PC)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.98 @ Outlet PC)
Total: $861.91
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-08-28 00:03 EDT-0400)