That will certainly be awesome! Very overclockable too - 4GHz should be easy.
I tried to find some info on FSX and whether it really makes good use of hyperthreading and tripple-channel ram (i.e. the features of an i7 vs i5), and, as with other games, I'm not really convinced it would. If you switched to the i5 760 and the mobo and ram in my post above, for example, I don't think gaming performance would really suffer and you'd free up about £170 which could get you an SSD maybe, or something more special in the GPU dept like a 480

. Maybe worth thinking about, or at least do a bit more research on benchmarks for i5 vs i7 in FSX or games in general.