How much to raise?

[pokerjoker]

I figure villan has flush/maybe straight draw. I want him to call a raise that is not worth it for him...but implied odds are weird, as I doubt I could fold to a $30 allin if the flush hits. Should I just push here and not worry? Should i just think that if the flush hits I fold to his river bet unless I get a fh?

Party Poker No-Limit Hold'em, $ BB (9 handed) converter

MP3 ($148.58)
CO ($270.15)
Button ($46.60)
SB ($234.05)
BB ($149.80)
UTG ($198.85)
Hero ($316.60)
MP1 ($157.10)
MP2 ($390.96)

Preflop: Hero is UTG+1 with 7[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $1.
<font color="#666666">1 fold</font>, Hero calls $2, <font color="#666666">6 folds</font>, BB checks.

Flop: ($5) Q[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $3</font>, BB calls $3.

Turn: ($11) 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $8</font>, <font color="#CC3333">BB raises to $30</font>, <font color="#CC3333">