For the deals you've answered your own question.
The i7 will work fine, will the i5 be good enough?
So i7 it is.
I think I'd go -V for the mobo, £30 less than the pro and I can't see much difference in the spec.
With the budget you have left you're looking at Radeon HD6970 or Nvidia GTX570 - but this stuff is beyond my pay grade as it were.