More cores is good for some people.
For me, processors that are good for gaming (generally quad-cores) are for me.
Or, maybe games will start being able to utilize 8-12 cores; then I'd get one.
Do without 8 gigs, put more into your graphics, get a Spinpoint F3, choose a 955 instead of a 965, and invest in a better case.
A CM 690 ii, NZXT Hades, or NZXT Phantom would be better.