Also, how much if any would a cheap MB effect performance, futhermore will this cpu (i7-2600K) be good for the extra $100 as a gamer, or will this be an overkill? I don't overclock, Have no idea how to do it and will most likley end up frying my cpu.
From what i can tell on the CPU charts there is not much differance
The extra $100 for the i7-2600k will get you 100MHz and Hyper Threading (HT). Games do not use HT so essentially you are paying $1 for each extra 1MHz.
The i5-2500k is generally the best CPU to get especially if you are going to overclock the CPU. Generally speaking a there is not too much performance difference between an average P67 motherboard and a premium P67 motherboard. Just buy a motherboard with good reviews.
Regarding AMD's upcoming Bulldozer CPU... it may or may not be as fast a Intel's current CPUs. You simply need to wait for benchmarks before making a decision on that CPU family.
Cant help but think my GPU is being bottlenecked by my cpu. Most games i can't play on high. Also games like WoW, I'm unable to do 25 man raids with graphics turned down -10FPS. And COD Black Ops, the pc really struggles to play that on low settings, small rooms are okay but out in the open PC struggles. And with the upcoming Battlefield and COD i would hate to be gimped for my first experiance of the game, again.
hmm that seems very strange are you on the latest Nvidia drivers, and assuming you replaced the graphics card did you uninstall all old drivers before installing that GTX570? an Overclock would help remove bottlenecking and a cooler like a hyper 212+ can also be used on a newer 1155 system if you decide to upgrade anyway!: http://msy.com.au/product.jsp?productId=1341
Yeah, its on latest drivers + installed GPU correctly.