1. This goes into the New Build
2. 2500K is as best as it gets for gaming.
Why a P67? A ASUS P8Z68 PRO/GEN 3 would do you better.
Guessing that RAM is 16GB, you only need at least 4GB, 8GB recommended.
The Keplar series and the 7800 series are coming out very soon. You might want to wait for those.
WD Green 1TB drives are cheaper than the Spinpoint, you might want to check out those.
Why not the CM Hyper 212 Evo?