What to do with AK here?

[LKJ]

Pokerstars $50 MTT...100 players left, 27 pay.
I am in the SB with A [img]/images/graemlins/club.gif[/img]K [img]/images/graemlins/spade.gif[/img]
Blinds 100/200, I'm 2nd in chips at this table with T8565, just got moved here no more than 9 hands ago.

UTG (T7825), even newer to the table, raises to 600
MP1 (T4760) calls
All others fold to me in the SB. I pop it to T2400.
UTG thinks and folds, MP1 pushes the rest of his stack all-in. Obviously I'm calling at this point, though I'm not happy about putting half my stack on the line against possibly two of the hands I do not want to see (and was only worried about UTG holding).

All thoughts on how I played/should play this hand would be appreciated.