Maya
Hmmm - so you'd see some of i7's benefit over i5 7xx, but being realistic, i7 will only give you up to around 25% (usually less) gain over i5 when rendering. i7 950 costs 67% more than i5 760 though, then there's the extra mobo cost. All in all, a lot of your tight budget for little performance gain. I'd go i5 760 and with the saved cash you can afford a decent PSU, a better GPU if any gaming is being planned, or bigger SSD, etc etc. Will also suit an 8GB RAM kit much better.