AK - post flop play

[shoeman]

How would you handle this situation? I got the flop I wanted and somebody came over the top.

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (10 handed) converter

SB (t960)
BB (t655)
UTG (t800)
UTG+1 (t800)
UTG+2 (t725)
Hero (t800)
MP2 (t915)
MP3 (t745)
CO (t775)
Button (t825)

Preflop: Hero is MP1 with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls t15, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t55</font>, <font color="#666666">2 folds</font>, CO calls t55, <font color="#666666">3 folds</font>, UTG+1 calls t40.

Flop: (t190) 2[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
UTG+1 checks, <font color="#CC3333">Hero bets t150</font>, <font color="#CC3333">CO raises to t350</font>, UTG+1 folds, <font color="#CC3333">Hero ??