Watch the flame war commence.......... For gaming you will almost never notice any difference between a high end AMD CPU and an Intel 4 Core CPU. This is because almost every single game at the moment is GPU limited and not CPU limited. For example one exception is RTS games that render shadows on the CPU in Epic battles with over 2k units on the screen. Supreme Commander does this. I have a see sig and one of my friends runs a few year old hex core AMD system with a HD7970 on a 1600p screen(30""). (not FM2 the highpower socket) There is no game that runs worse on his system then on mine. (we where bored once and tested loads of games on full settings.
Someone on another forum made the point I could just get a new motherboard, something which had completely slipped my mind... However I've got a friend interested in my board, cpu, psu, ssd, 1 hdd and cooler, so based on that I did some quick calculations. If I go for the 760k, I should end up £35ish in pocket, keeping my current cpu £50 out of pocket, and going haswell £0+ out of pocket depending on the cpu I go for. I'm actually leaning towards the AMD since I like the idea of having something a little fun to play with and overclock, also the savings can be put towards a new gpu in the future... Edit: Those figures are based on: Buying for each: 450W sfx £65 mitx parvum £100 3tb £90 enermax elc120 £45 Then a board (AMD: £50, haswell: £65, sandy: £60) and the cpu itself (AMD: £65, haswell: £85+)