76s near the bubble

[Rooger]

10$ tournament on PokerChamps - 28 players left, money for the first 18.
Blinds are 300/600, ante 50 - my stack is around 6500, BB has me covered, MP has slightly less than me, and button has me covered.

I pick up 7[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/heart.gif[/img] in the SB. MP & button limps, i complete (occasionally I like to play suited connectors at this point of the tourney, and I need to call 300 in a 2700 pot).

The flop comes 8[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img]

I check, BB & MP checks, and button bets 3000.
Button has been playing quite loose - I put him on Kx, perhaps Ax (with so many passive players in front of him, and the big stack, it's a perfect time for a steal).

Do you push? Fold? If I call, I'm pot committed, and will probably end up putting all my chips in anyway, so I guess it's a push or a fold.

If he has a king, my 15 outs will let me win 55% of the time - he could have a set of 8's or 9's, but the size of the bet makes me think he doesn't have it.

What is your action?