I have a straight, bet river?

[LimitLoser]

I just sat down at the table so no reads at this time. How is my raise on the turn? I wanted to give myself the chance to stack him off without having to overbet the river if I liked what I saw. Is this an easy bet?

Party Poker No-Limit Hold'em, $2 Hero (6 handed)

Button ($111.80)
SB ($97.77)
Hero ($200)
UTG ($105.64)
MP ($190.35)
CO ($246.55)

Preflop: Hero is BB with 7[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img]. SB posts a blind of $1.
<font color="#666666">3 folds</font>, Button calls $2, SB (poster) completes, Hero checks.

Flop: ($6) 3[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, Button checks.

Turn: ($6) 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets $10</font>, <font color="#CC3333">Hero raises to $30</font>, Button folds, SB calls $20.

River: ($66) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero...