Flopped nut straight OOP against two opponents

[Hollywade]

When is the best time to pop it? Flop? Turn? River? The turn seemed like a good time to me, especially since it made a four-card straight. I'm scared to lose both of them. However, since I'm a nit, I'm also scared of the board pairing. Thoughts?

Full Tilt No-Limit Hold'em, $0.50 BB (6 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($35.75)
SB ($49.50)
Nit ($47.50)
UTG ($22.25)
MP ($60.15)
CO ($26.80)

Preflop: Nit is BB with Q[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/spade.gif[/img].
UTG calls $0.50, MP calls $0.50, <font color="#666666">3 folds</font>, Nit checks.

Flop: ($1.75) 8[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Nit checks, <font color="#CC3333">UTG bets $1</font>, MP calls $1, Nit calls $1.

Turn: ($4.75) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
Nit checks, <font color="#CC3333">UTG bets $3</font>, MP calls $3, <font color="#CC3333">Nit raises to $9</font>, <font color="#CC3333">UTG raises to $23.75 (All-In)</font>, MP folds, Nit calls $11.75.

River: ($49.25) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: $49.25