PS $6.50: AKo Should I push on flop

[jayou]

Should I push on this flop or just check behind. Also should I have just got it all in pf after the re-reaise.

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

MP2 (t2045)
MP3 (t1150)
Hero (t1425)
Button (t2350)
SB (t1540)
BB (t1350)
UTG (t2000)
UTG+1 (t590)
MP1 (t1050)

Preflop: Hero is CO with K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img].
UTG calls t50, UTG+1 calls t50, <font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to t250</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">BB raises to t450</font>, UTG folds, UTG+1 calls t400, Hero calls t200.

Flop: (t1425) 5[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, UTG+1 checks, <font color="#CC3333">Hero?