AA on the button, advice needed on my river play

[sasubpar]

No reads on the villan, only my second hand at the table. I'm curious about my river play.

Party Poker 0.5/1 Hold'em (7 handed) converter

Preflop: Hero is Button with A[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/spade.gif[/img].
UTG calls, MP1 folds, MP2 folds, CO folds, <font color="#CC3333">Hero raises</font>, SB calls, BB folds, UTG calls.

Flop: (7 SB) 4[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, UTG checks, <font color="#CC3333">Hero bets</font>, SB calls, UTG folds.

Turn: (4.50 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">SB raises</font>, <font color="#CC3333">Hero 3-bets</font>, SB calls.

River: (10.50 BB) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">SB raises</font>, Hero...

On the flop I'm figuring he has either something like AJo or possibly A7 suited. His turn raise is somewhat of a surprise to me and makes me think A7h or even Axh is a real possibility. His river raise re-enforces that in my head.