If all you are doing is is gaming, then go with a nice 2500k build> You don';t need any more than that. If you are like me and do the following:
Run more than 1 VM for extended periods of time at the same time (I run 2 at a time for several hours and do some heavy work in them)
Do LOTS of video encoding
Do a LOT of audio processing
Do CAD or any very heavy memory/cpu based program
Plan to do quad SLI
you need a LOT of sata ports (more than 8)
then you should go either an i7 or go 2011.
If not, save yourself some cash and grab a 2500k. They hold up VERY well under gaming (I pretty much max most games with my setup) and can handle just about anything. Most games cannot even take advantage of a quad.
The only game that I know of that can do more than 2 cores is BF3 and it only uses 3 cores effectively.