If you are tempted by the I7, the 930 should be out relatively soon if you could hold out for that.
The I7 is definately better, in terms of gaming performance, it would help improve your framerates slightly, but its the Graphics cards that make the difference. Given the above cpu/MB come in at the price of the 920 alone, you are talking another £130+ ontop for the most basic of i7 compatable boards, even more so if you wish to get tri-channel ram.
As such, if you are thinking of swaying towards intel, then I would suggest to stick with the I5.
Imo, depending how much you wanted to push your budget, the AMD above is good, and you could invest the money saved, to upgrade the CPU in say 6 months, when AMD's new line come out(or invest in some games
)
