Confused on the flop lvl4 5-handed

[Eyeback]

Table seems fishy and limps in with many hand. (mp seems to be an exception)

Party Poker No-Limit Hold'em Tourney, Big Blind is t100 (5 handed) converter

Button (t3932)
SB (t212)
Hero (t830)
UTG (t1630)
MP (t1396)

Preflop: Hero is BB with 9[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img].
UTG calls t100, MP calls t100, <font color="#666666">1 fold</font>, SB completes, Hero checks.

Flop: (t400) 9[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, Hero ???

Should I push a marginal hand like this or wait for better oppertunity to make it itm?