$11 NLTRN: TT OOP and all-in preflop

[Somekid]

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (2 handed)
Button (t1545)
Hero (t1455)

Preflop: Hero is BB with T[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">Button raises to t150</font>, <font color="#CC3333">Hero raises to t1455</font>

My opponent had been raising almost every single button to 3 BB. Is pushing okay here, or should I be 3-betting less? I was worried that if I didn't shove, an overcard would almost certainly fall and I'd be in a bit of trouble.

Would a better play be to 3-bet fairly large, like to 600 and then shove any flop?