200NL AQs tough river decision

[bdawg56kg]

Villian seems solid from what I've observed. My image was LAG. I have been getting a lot of playable hands, and have been caught bluffing once or twice. Since then I've settled down, and have been relatively inactive for the last couple orbits. Not sure if anyone has noticed any of this though. What do you put SB on?

PokerStars No-Limit Hold'em, $2 BB (9 handed) FTR converter on zerodivide.cx

UTG ($237)
Hero ($195.80)
MP1 ($255)
MP2 ($188)
MP3 ($200)
CO ($272.90)
Button ($68.35)
SB ($304.50)
BB ($416.85)

Preflop: Hero is UTG+1 with Q[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img].
1 fold, Hero raises to $8, 5 folds, SB calls $7, 1 fold.

Flop: ($18) 2[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/spade.gif[/img] (2 players)
SB checks, Hero bets $12, SB calls $12.

Turn: ($42) Q[img]/images/graemlins/heart.gif[/img] (2 players)
SB checks, Hero checks.

River: ($42) 2[img]/images/graemlins/heart.gif[/img] (2 players)
SB bets $40, Hero ???