55speed; 1sthand TopPair in SB

[nthn2fancy]

PartyPoker, Big Blind is t40 (10 handed) Converter on pregopoker.com

UTG (t2000)
UTG+1 (t2000)
MP1 (t2000)
MP2 (t2000)
MP3 (t2000)
CO+1 (t2000)
CO (t2000)
Button (t2000)
SB (t2000)
Hero (t2000)

Preflop: Hero is in BB with 8[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/spade.gif[/img]
<font color="gray">UTG folds</font>, <font color="gray">UTG+1 folds</font>, <font color="gray">MP1 folds</font>, <font color="gray">MP2 folds</font>, <font color="gray">MP3 folds</font>, CO+1 calls t40, CO calls t40, Button calls t40, SB calls t20, Hero checks

Flop: (t200) 5[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/heart.gif[/img] (5 players)
SB checks, <font color="red">Hero bets t90</font>, <font color="gray">CO+1 folds</font>, <font color="gray">CO folds</font>, Button calls t90, <font color="gray">SB folds</font>

Turn: (t380) 2[img]/images/graemlins/spade.gif[/img] (2 players)
<font color="red">Hero ?</font>

I hate being in these situations. Checking is too weak but how much do i throw out here?