AA decision with big stack in on turn scary board

[DMACM]

To be honest I thought this was an easy decision but I want to see what everyone else thinks. Especially after seeing the responses on how an "unknown" plays in 200 dollars sngs. I was on aim and four tables without PT so for all intents and purposes opponent is an unknown.

Poker Stars, $5 + $0.50 NL Hold'em Tournament, 25/50 Blinds, 6 Players
LeggoPoker.com - Hand History Converter

BB: 1,685
UTG: 2,175
Hero (MP): 2,790
CO: 1,110
BTN: 1,925
SB: 3,815

Pre-Flop: (75) A[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img] dealt to Hero (MP)
UTG folds, <font color="red">Hero raises to 150</font>, 2 folds, SB calls 125, BB folds

Flop: (350) 3[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">SB bets 650</font>, Hero calls 650

Turn: (1,650) J[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">SB bets 3,015 and is All-In</font>, Hero ?