PARTY POKER $1M TOURNEY....what should i have done?

[XXXNoahXXX]

Top 180 get paid...180th gets $800....190 left....Blinds are 400/800....I have enough chips for three full orbits if I fold every hand, definitely enough to get me in the money, but not enough to do any damage unless I double up at least twice. In the BB I get dealt KK and everyone folds to the button who bets enough to put me all in. I know he probably has Ax or worse and I have him dominated, but should I make this call? I'm risking a guaranteed $800 for the chance of building my stack which is only about 1/4 of the average. Does it all come down to how much the $800 means to me, or should I face the reality that I'm not taking down any big money and be happy to fold out to my free money?