Sorry about the double post earlier. With that kind of cash, you can forget about the 7950. This is about as good as you are gonna get. I recommend jumping on this now before you lose the rebates. It is about $800, but there is over $70 in rebates, so it brings the price alot closer to your $700 price mark.
PCPartPicker part list: http://pcpartpicker.com/p/nKQg
Price breakdown by merchant: http://pcpartpicker.com/p/nKQg/by_merchant/
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($169.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($26.29 @ NCIX US)
Motherboard: ASRock Z75 Pro3 ATX LGA1155 Motherboard ($79.56 @ Newegg)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1600 Memory ($37.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($69.99 @ NCIX US)
Video Card: Asus Radeon HD 7870 GHz Edition 2GB Video Card ($229.98 @ NCIX US)
Case: Antec DF-35 ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: Corsair Builder 500W 80 PLUS Certified ATX12V Power Supply ($37.99 @ Newegg)
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-11-14 19:45 EST-0500)
Note: The CPU is priced at microcenter. If you have one near you, then go there, if not it is $216 on NCIX, which brings up the price accordingly.