ATo on the Bubble

[skirtus]

These kinda of hands are always tough for me on the bubble. Early on I auto-fold this. Not sure why UTG doesn't push but suspect he has a good hand but not a great hand. CO is in dire straits and could have anything. Im thinking of pushing and either lose half my stack or knock out 2 people and have a big enough stack to pressure the rest of the table. What would you do here?

Party Poker No-Limit Hold'em Tourney, Big Blind is t100 (6 handed)

MP (t2050)
CO (t160)
Button (t1700)
Hero (t850)
BB (t2820)
UTG (t420)

Preflop: Hero is SB with T[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="CC3333">UTG raises to t300</font>, MP folds, CO calls t160 (All-In), Button folds, <font color="CC3333">Hero ??