Find a fold in the madness?

[DCWildcat]

The table got ultra laggy when some unpredictable players sat down a few hands ago. I'll do reads as they come up in the hand; there's a lot of them.

Party Poker 1/2 Hold'em (9 max, 8 handed) FTR converter on zerodivide.cx

Preflop: Hero is MP1 with 8[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img]. UTG posts a blind of $1. UTG+1 posts a blind of $1.
UTG (poster) checks, UTG+1 (poster) checks, Hero calls, MP2 calls, <font color="#666666">1 fold</font>, Button calls, <font color="#CC3333">SB raises</font>, BB calls, UTG calls, UTG+1 folds, Hero calls, MP2 calls, Button calls.

With two posters in front of me checking, I think this is an ok limp.

Flop: (13 SB) 3[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">BB raises</font>, UTG calls, <font color="#CC3333">Hero 3-bets</font>, MP2 folds, <font color="#CC3333">Button caps</font>, SB calls, BB calls, UTG calls, Hero calls.


I 3-bet with probably the best hand on an unfortunately draw-heavy board.
SB is unpredictable player, raising any PP preflop, only calling with high cards. Insensitive to postion. Postflop, he goes ballistic with the PP's, moderately aggressive with high cards. Despite this, he's only 24/6/1 (over just 33 hands). BB just sat down a hand ago. Button's cap caught me off guard. I think WPT watching him, a bad high school no limit player stuck in a limit game. Can't value his hands for [censored]. 48/11/3.

Turn: (16.50 BB) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, UTG checks, <font color="#CC3333">Hero bets</font>, Button calls, SB calls, BB calls, UTG calls.

Even though it helps all straight draws, all the aggression on the flop makes me doubt there's a straight out there. Surprised I didn't get check-raised.

River: (21.50 BB) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, UTG folds, Hero calls.

Well, no flush is out, and the only straight this completes would have hit on the turn (JT). SB's betting out is odd, and I have to beat another caller. Am I good 1 in 10 here?