set of 4's at borgata 10/25, what bet?

[daniel1222]

Action game with decent players. Five, including myself, with 44 in the BB, limp pre-flop. Dream flop of K42 rainbow. With this many players in, I check and wait to see what develops. I am not disapointed. Guy immediately to my left makes it 150 and gets two callers by the time it gets to me. I have about 1500, others in hand have stacks ranging fron 2-4 thousand. I know no one has limped with KK, and yet I cannot figure out what to bet so as to isolate one guy, considering three people felt a pot that was unraised pre-flop was worth 150 on the flop. About 600 in the pot now.
Results to follow.