[Sidekick]

With the aggression that villain has shown, and my stack vs. his stack and the blinds as high as they are? I would push this PF every time.

With half his chips in the middle if you don't bet the flop he's going to be all-in every time even if he has 32o.

Even if he has a real hand you are still in good or possibly even great shape (especially if he's got something like ATo) when you push back at him. This late in the tournament there isn't much that he's going to have where you are in real trouble preflop.

If he's just trying to steal the blinds with rags and you come over the top, then most times he will fold or you go into the flop with a huge lead.

In this situation I'm willing to make a stand with AQo preflop against a known highly aggressive player for all his chips.

*** Edit ***
The only exception would be if villain has pushed EVERY time, but now only comes in for half his stack. Then I'd fold.