PS $27 turbo: Defending blinds

PokerStars No-Limit Hold'em Tourney, Big Blind is t150 (5 handed) converter

UTG (t2365)
MP (t3765)
Button (t2935)
SB (t2475)
Hero (t1960)

Preflop: Hero is BB.
<font color="#666666">2 folds</font>, <font color="#CC3333">Button raises to t450</font>, <font color="#666666">1 fold</font>.

What sort of range should BB push with here? (I assume calling really isn't an option given hero is OOP post-flop, correct me if I am wrong.)

Would it make a difference if all the stacks were identical (before posting blinds).