Re: 1500$ Gaming rig
As your psu is good, an i7 1156 and a 5870 should run still on it.
A 1366 is over kill for gaming, an i5 is just fine, but the HT of a 1156 i7 will help with the other stuff you do.
I'm not a component spec'r so someone else can tell you that, but an the 1156 fsb chips should do you fine, and keep your psu still alive. Its a great psu, so why waste it.
Foldie = i7 950@ 4.0Ghz Gigabyte x58a-ud3r EVGA 970 SC Corsair H100 Corsair hx520 3x2gb OCZ Gold Corsair 650D
Woohoo = L5639 @3.1Ghz EVGA SR-2 gtx 260-216 Hyper 212+ Corsair 1050hx 6x2gb Corsair XMS3 Blackhawk Ulra
Alienware 18 - SLI 770M 4700mq 16Gig