Once you get past two cores there aren't many games you'll notice much of a difference in. Mhz count more than cores in this case.
Still, I'd get the cheap quad and set it to 3.4ghz like most people are doing.
This is strictly a gaming rig. I don't overclock and want the chip to last as long as possible...
3 core at 3ghz or 4 core at 2.8...
What would you choose...
