Ultimate Bet No-Limit Hold'em Tourney, Big Blind is t40 (7 handed) converter

Hero (t2040)
BB (t740)
UTG (t4705)
MP1 (t965)
MP2 (t1010)
CO (t2895)
Button (t2645)

Preflop: Hero is SB with , .
1 fold, MP1 calls t40, 1 fold, CO raises to t180, Button raises to t320, Hero ___________?


This was in a 10 man SnG that I hadn't been paying attention to so I don't really have any reads. What's your line of thinking here?