Alright, this build lands within your budget and throws in an additional 760 in sli giving you more than 780 performance. A killer rig.
PCPartPicker part list:
http://pcpartpicker.com/p/3bUcT
Price breakdown by merchant: http://pcpartpicker.com/p/3bUcT/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3bUcT/benchmarks/
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($189.99 @ Micro Center)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.99 @ NCIX US)
Thermal Compound: Arctic Silver 5 High-Density Polysynthetic Silver 3.5g Thermal Paste ($6.73 @ OutletPC)
Motherboard: ASRock Z87 Extreme4 ATX LGA1150 Motherboard ($119.99 @ Micro Center)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($69.99 @ Newegg)
Storage: Western Digital Caviar Black 1TB 3.5" 7200RPM Internal Hard Drive ($88.98 @ SuperBiiz)
Video Card: Zotac GeForce GTX 760 2GB Video Card ($241.99 @ SuperBiiz)
Case: Thermaltake Commander MS-I Epic Edition (Black/Red) ATX Mid Tower Case ($55.99 @ Mwave)
Power Supply: EVGA SuperNOVA NEX750B BRONZE 750W 80+ Bronze Certified Semi-Modular ATX Power Supply ($59.99 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.98 @ OutletPC)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.98 @ OutletPC)
Total: $943.60
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-18 02:08 EDT-0400)