When to Push Short Stacked

[betgo]

Paradise $40 MTT 13 of 70 players left. 10 places pay. Blinds 300/600/50. I am one of shortest stacks with T3000 5xBB. I can probably fold into the money, but that is not my goal, as I would get blinded down pretty bad.

7-handed it is passed to me with the following hands on successive deals: 65o in CO, Q6o with 4 players to act, and A3 with 5 players to act.

I didn't play 65o or Q6o, but pushed with A3o. Is this right? Generally A3 is dominated if called, but in this situation I figure I might be called by a K or Q high hand or by the BB without much.

The wound up getting called by 99 and busting out.

Which if any of these hands would people push with?