$22s - AKo in SB, push or standard raise?

[Askilus]

PartyPoker $22 Speed Tournament, Big Blind is t200 (5 handed) Converter on pregopoker.com

UTG (t4180)
CO (t4626)
Button (t4379)
Hero (t2090)
BB (t4725)

Preflop: Hero is in SB with A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img]
<font color="gray">UTG folds</font>, <font color="gray">CO folds</font>, <font color="gray">Button folds</font>, Hero ???

Villian seems loose (37% VPIP) but since there hasn't been a lot of raising/pushing going on yet so I don't know his range if I push. Push this or raise to something like t500?

Thanks!

Regards,
Fredrik