Help Me Settle an Argument

[mikeJ]

I was arguing w/ a friend about what the correct action is on the flop. Preflop is fine, as the button was extremely passive/bad, limping a lot. BB has been tight, showing down strong holdings. Hero's image is aggro, but not overly so. Hero has been showing down reasonable holdings.

Situation: End of a 2000+ entrant MTT, $11 buy-in (Please excuse the buy-in level)

PokerStars No-Limit Hold'em Tourney, Big Blind is t60000 (3 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button (t1951993)
Hero (t3404613)
BB (t1378394)

Preflop: Hero is SB with K[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/club.gif[/img].
Button calls t60000, <font color="#CC3333">Hero raises to t240000</font>, BB calls t180000, Button folds.

Flop: (t492000) K[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero ?