A passive set Party 1/2 6-max deepish

[Ghazban]

Villain has been somewhat aggressive postflop when he's been the preflop raiser (which has been extremely rare, he's about 45/4 after 80 hands). He hasn't shown down anything that made me wonder WTF he was doing postflop but he hasn't gotten to showdown much, either.

Party Poker No-Limit Hold'em, $2 BB (6 max, 6 handed) FTR converter on zerodivide.cx

MP ($19.10)
CO ($345.20)
Button ($424.55)
Hero ($334.40)
BB ($41.20)
UTG ($195)

Preflop: Hero is SB with 5[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/heart.gif[/img]. Hero posts a blind of $1.
UTG calls $2, <font color="#666666">1 fold</font>, <font color="#CC3333">CO raises to $8</font>, <font color="#666666">1 fold</font>, Hero (poster) calls $7, <font color="#666666">1 fold</font>, UTG calls $6.

Flop: ($26) T[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $18</font>, UTG folds, <font color="#CC3333">CO raises to $50</font>, Hero calls $32.

I led out here to try and trap some money from UTG if he has anything and to build the pot. If I check/call, I might get some money from UTG but can't build the pot fast enough to get all-in by the river. If I check/raise, I'm almost guaranteed to lose UTG. I did the long gee-I-think-AT-might-be-good-but-I-don't-know pause before calling.

Turn: ($126) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets $95</font>, Hero calls $95.

Again, I do the tough-decision pause before calling.

River: ($316) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
I check, he pushes, I call (quickly this time [img]/images/graemlins/tongue.gif[/img])

Comments on all streets appreciated; please give villain a range of hands, too.