Correct to push?

[kiffl]

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (9 handed) converter

SB (t755)
BB (t785)
Hero (t800)
UTG+1 (t560)
MP1 (t755)
MP2 (t1975)
MP3 (t800)
CO (t815)
Button (t755)

Preflop: Hero is UTG with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">Hero raises to t80</font>, <font color="#666666">2 folds</font>, MP2 calls t80, <font color="#666666">1 fold</font>, CO calls t80, <font color="#666666">3 folds</font>.

Flop: (t262.50) A[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets t100</font>, MP2 folds, <font color="#CC3333">CO raises to t200</font>, Hero reraises all-in, CO folds.

Final Pot: t562.50

As the post says, is this the right time to push or should I wait until I later street? I'm really surprised he folded since he had already put so much in the pot.

EDIT: Had to add my all in because the converter cut it off.