AKo early. Push here?

[jeffraider]

Party Poker No-Limit Hold'em Tourney, Big Blind is t30 (10 handed) converter

BB (t760)
Hero (t775)
UTG+1 (t130)
UTG+2 (t1010)
MP1 (t1255)
MP2 (t825)
MP3 (t1115)
CO (t440)
Button (t945)
SB (t745)

Preflop: Hero is UTG with K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img]. Hero raises to 100. 5 folds. CO calls 100. 2 folds. BB raises to 320. Hero ???