50NL, weaker Q, or a set?

[iheartponeez]

Villain seems intelligent

$0.25/$0.5 No Limit Holdem
6 players
Converted at weaktight.com

Stacks:
Hero (<font color="#0000cc">$50.00</font>)
UTG+1 (<font color="#0000cc">$30.80</font>)
CO (<font color="#0000cc">$59.55</font>)
BTN (<font color="#0000cc">$10.35</font>)
SB (<font color="#0000cc">$94.70</font>)
BB (<font color="#0000cc">$49.00</font>)

Pre-flop: ($0.75, 6 players) Hero is UTG A[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/diamond.gif[/img]
<font color="#cc0000">Hero raises to $2</font>, <font color="#777777">3 folds</font>, SB calls $1.75, <font color="#777777">1 fold</font>

Flop: 7[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/spade.gif[/img] ($4.5, 2 players)
SB checks, <font color="#cc0000">Hero bets $3</font>, SB calls $3

Turn: T[img]/images/graemlins/heart.gif[/img] ($10.5, 2 players)
SB checks, <font color="#cc0000">Hero bets $7</font>, SB calls $7

River: 9[img]/images/graemlins/club.gif[/img] ($24.5, 2 players)
SB checks, <font color="#cc0000">


Once he instacalled my turn bet, I got worried. He's not on a draw, so how do you play this? To me it looks like I have to decide if I'm going to town with TPTK or not. Since he's intelligent, I worry about the likelihood he calls 2 barrels with KQ or QJ. Do you bet this river? How much? What if he shoves?