I want to stick my head in the sand with this KK hand.

[DONTUSETHIS]

I think i would raise preflop a little more to say 800 or so to try to really thin the field. The flop is a tough spot. I think the CO would have the largest range of hands since both the other limpers called and he was getting such a good price. I think you are in a raise or fold spot. I would raise him to about 3000 and probably go broke on this hand if he has me beat.