Physically Possible to do better with £1200 ?

I'm looking to build something very similar to you but I see these two as being the best choice to keep the budget around 1200 - 1300... Just which one to choose I'm confused on for performance.

Gainward GeForce GTX 580 "Phantom" 3072MB GDDR5 PCI-Express Graphics Card **Supplied with FREE Batman: Arkham City PC game** £455.99
(£379.99) £455.99
(£379.99)
MSI ATI Radeon HD 6950 OC Twin FrozR III Power Edition 2048MB GDDR5 PCI-Express Graphics Card with Dirt3 & Deus Ex PC Games £229.99
(£191.66) £459.98
(£383.32)
 
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