FTP Daily Double, Bubble Question

[Harv72b]

H4H in Daily Double ($10+2) A on FTP last night, next player out gets nothing, player after that nets a whopping $5. Avg. stack is around t12k.

Button is pretty well unknown--he's just been moved to the table a couple orbits before. All he's seen me do is fold preflop or win the blinds with a raise.

SB had been the table chip leader for most of the last hour, until he doubled me up maybe 30 minutes ago & then another player shortly after that. Since that happened he hasn't challenged me in a pot, but he does love to see flops for the most part. I don't think he's tricky enough to flat call here with a huge hand--he seems like the type of player who'd rather just get it all in with a perceived advantage.

What's my move?

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t400/t800
(Ante: t100)
9 players
Converter

Stack sizes:
UTG: t2867
UTG+1: t8941
MP1: t12517
MP2: t14855
MP3: t14651
CO: t6575
Button: t14601
SB: t11778
Hero: t6835

Pre-flop: (9 players) Hero is BB with A[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img]
6 folds, <font color="#cc0000">Button raises to t1600</font>, SB calls t1200 <font color="aaaaaa">(pot was t3700)</font>, Hero...?