(16) Midgame AK--weak tight?

[Dan.]

Villian thought for a while before making this raise. Should I have shoved? Felt like a really bad move.

PokerStars Tournament, Big Blind is t100 (6 handed) Converter on pregopoker.com

UTG (t1450)
UTG+1 (t3265)
CO (t1250)
Hero (t2665)
SB (t1130)
BB (t3740)

Preflop: Hero is in Button with K[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/club.gif[/img]
<font color="gray">UTG folds</font>, <font color="gray">UTG+1 folds</font>, <font color="red">CO raises to t500</font>, <font color="gray">Hero folds</font>