I agree with Roark, the performance difference at stock is almost non existant, P67/Z68 boards are cheaper, and the 2600k overclocks like a dream. I had my 2600k build for a year, clocked @5.2GHz for at least 90% of its life. My kid has it now, still running at 4.7GHz. Your choice, but I recommend the 2600k.