50NL - Overpair on a scary river

[mattgoody]

Ive played like 15 hands with villain, he hasnt done anything spectacular. Seems very passive, but mayb not a complete retard.

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

Stacks:
UTG (<font color="#0000cc">$49.20</font>)
CO (<font color="#0000cc">$127.15</font>)
BTN (<font color="#0000cc">$51.60</font>)
SB (<font color="#0000cc">$58.60</font>)
Hero (<font color="#0000cc">$97.60</font>)

Pre-flop: ($0.75, 5 players) Hero is BB Q[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/heart.gif[/img]
<font color="#777777">3 folds</font>, <font color="#cc0000">SB raises to $1.5</font>, <font color="#cc0000">Hero raises to $5</font>, SB calls $3.5

Flop: 7[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img] ($10, 2 players)
SB checks, <font color="#cc0000">Hero bets $7.5</font>, SB calls $7.5

Turn: 4[img]/images/graemlins/spade.gif[/img] ($25, 2 players)
SB checks, <font color="#cc0000">Hero bets $18.5</font>, SB calls $18.5

River: 6[img]/images/graemlins/spade.gif[/img] ($62, 2 players)
SB checks, <font color="#0000cc"> Hero ($66.6)?</font>

I cant decide whether or not to bet this river. All of his 2nd pair/straight draw hands have be beat now with 2pair or the straight, but i feel like AT KT QT JT 9T JJ 99 are all a big part of his range. Is this a bet or check?