mtt on pokerroom and cowboys...

[cocarondelle]

blinds 1000-2000.

Hero - has 25,000 chips.
Enemy - has 40,000 chips.

im utg+1 and get dealt KK (note: i have trouble getting off of KK , especially preflop)

utg folds i limp in as everyone does to the bb who raises to 6000. I move all in with my cowboys and he takes a long time before he calls. He shows AK. the flop comes rags and he catches an Ace on the turn knocking me out. I still placed in the money, but i was thinking that i made a mistake preflop. WOuld u guys have raised it utg+1, or limp+raise, or flat call and move all in if the flop came no aces? I now think i should have done the stop+go move. What do you guys/gals think?