muddy83gmc :
The game that I play most often is BF3 that's why I was leaning towards the 560ti. It seems the 7850 beats the 560ti in just about everything except that. Will it really make that much difference going with the 7850 vs the 560ti?
Edit: As far as OCing SB vs IB, I'd seen numbers near 5ghz for the 2500k but assumed that was with a hell of a lot of tweaking, cooling, and luck. I most likely would not push anywhere near that. Would I be better off to push back to the 2500k then?
Going with the 7850 will not give a big performance boost over the 560 Ti, more like 5-8% on average, which is not a deal breaker for the 560 Ti, and BF3 is a nVidia favored game.
As far as the OC'ing, you can OC Ivy Bridge just fine, as long as the voltage is kept at or below the 1.325v level (or as close to stock as possible), otherwise temps can skyrocket in a hurry. An i5-3570K doesn't actually need to OC as high as an i5-2500K because it is slightly more powerful on a per clock cycle basis. OC'ing on Sandy Bridge was excellent, you didn't have to be super lucky to hit 5 GHz on a 2500K (but you are right about needing pretty substantial cooling for it). I wouldn't recommend dropping to the 2500K, since if both it and the 3570K were OC'ed to, say, 4 GHz, you would see a small advantage with the 3570K, again because of the increased IPC.