11 left in 180-man Stars MTT. Table is 6-handed. I'm in the lower tier of stack sizes. Villan is a tight player who has stolen before, but I haven't ever seen him make a raise of this size before. Whats your move?

PokerStars No-Limit Hold'em Tourney, Big Blind is t1600 (6 handed) FTR converter on zerodivide.cx

Hero (t16761)
UTG (t24045)
MP (t24649)
CO (t12906)
Button (t15951)
SB (t25500)

Preflop: Hero is BB with 9[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Button raises to t8000</font>, <font color="#666666">1 fold</font>, Hero ?