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I've nothing against Nvidia, but I must confess I am struggling with the concept of a 780 Ti (3GB version) @ £550+
The 780 Ti will have to overclock very well for that price point to make any sense vs. the AMD offerings even when making allowances for an Nvidia price premium.
Remember the 560Ti cards....the success was built on super speed and undercutting the competition, those in the know (or knew how to look up benchmarks) could by a super fast card for less than the performance equivelent (either AMD or Nvidia themselves)
Pricing is key here......more than £300 and it will be a FAIL !