Hmmm. A 2600K is not going to make much noticeable difference over what you have for gaming, but for some of the other stuff, yeah, it will make a difference. Since Ivy Bridge is only a few months away, unless your budget is tight, I would wait for it if I had your build right now. Even if you don't build with it, its going to cause the price of the current hardware to drop some, I am sure.
Yeh my buget is tight, and its staring to get to me, just the little thing, like GTA iv \as badly optimzed as it is) running at an extremely low framerate.