AA 3rd hand into tournament. How would YOU play it?

[MrMoo]

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (10 handed) converter

MP2 (t1500)
MP3 (t1575)
CO (t3000)
Button (t1470)
SB (t1425)
BB (t1500)
UTG (t1530)
UTG+1 (t1500)
Hero (t1500)
MP1 (t1500)

Preflop: Hero is UTG+2 with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img].
UTG calls t15, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t50</font>, <font color="#666666">3 folds</font>, CO calls t50, <font color="#666666">1 fold</font>, SB calls t40, <font color="#666666">1 fold</font>, UTG folds.

Flop: (t177.50) Q[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets t150</font>, CO folds, SB calls t150.

Turn: (t477.50) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t250</font>, <font color="#CC3333">Hero raises to t750</font>, SB calls t500.

River: (t1977.50) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB is all-in [475] , Hero ???

How would you play it and why?