Might as well get a new computer and you could SLI 2 670's or 7970 Ghz edition if you want.
PCPartPicker part list:
http://pcpartpicker.com/p/SPmS
Price breakdown by merchant: http://pcpartpicker.com/p/SPmS/by_merchant/
Benchmarks: http://pcpartpicker.com/p/SPmS/benchmarks/
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($189.99 @ Microcenter)
CPU Cooler: Noctua NH-D14 65.0 CFM CPU Cooler ($79.98 @ Outlet PC)
Motherboard: ASRock Z77 Pro4 ATX LGA1155 Motherboard ($109.98 @ Outlet PC)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory ($74.99 @ Newegg)
Storage: OCZ Vector Series 256GB 2.5" Solid State Disk ($229.50 @ Newegg)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($89.99 @ Newegg)
Video Card: Gigabyte Radeon HD 7970 3GB Video Card ($389.99 @ NCIX US)
Case: Cooler Master HAF 922 ATX Mid Tower Case ($82.00 @ Newegg)
Power Supply: Thermaltake Black Widow 850W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($97.36 @ TigerDirect)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($17.98 @ Outlet PC)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($95.98 @ Outlet PC)
Total: $1457.74
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-04-24 18:07 EDT-0400)
Feel free to change that, I just made it as a template.