25nl: Flopped nut flush, turn line?

[Flups]

So, woohoo, flopped the nuts. Say I put opponent on most likely a flopped set and maybe a lower flush, overpair or 2 -pair. On the turn effective stacks are almost $22 and the pot is $10.65. My problem is this: if I bet (close to)the pot now, I have less then 1/2 a PSB left on the river and can't get away then when the board pairs and he possibly filled up. If I overbet push now, I might not get as much value out of the hands I put opp. on. And if I check with the intention of CRAI-ing, opp. might take the free card. What do I do now and what do I do when the river pairs?

Before I forget: over 131 hands opp. is 9.9/0/0.23

Poker Room skin
No Limit Holdem Ring game
Blinds: $0.15/$0.25
7 players
Converter

Stack sizes:
HERO: $26.15
UTG+1: $7.60
MP1: $25.90
CO: $30.55
Button: $36.55
SB: $18.10
BB: $32.95

Pre-flop: (7 players) HERO is UTG with Q[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/heart.gif[/img]
<font color="#cc0000">HERO raises to $1</font>, UTG+1 calls, MP1 calls, 3 folds, BB calls.

Flop: 9[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/heart.gif[/img] ($4.15, 4 players)
BB checks, <font color="#cc0000">HERO bets $3.25</font>, UTG+1 folds, MP1 calls, BB folds.

Turn: K[img]/images/graemlins/spade.gif[/img] ($10.65, 2 players)
<font color="#cc0000">HERO ?</font>