[200nl] Turned boat, how much to bet

[Vammakala]

Poker Stars
No Limit Holdem Ring game
Blinds: $1/$2
6 players
Converter

Stack sizes:
UTG: $97.35
UTG+1: $185
Hero: $374.25
Button: $53.70
SB: $67.35
BB: $367.40

Pre-flop: (6 players) Hero is CO with 5[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/diamond.gif[/img]
2 folds, <font color="#cc0000">Hero raises to $8</font>, 2 folds, BB calls.

Flop: J[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/club.gif[/img] ($17, 2 players)
BB checks, Hero checks.

Turn: 5[img]/images/graemlins/club.gif[/img] ($17, 2 players)
<font color="#cc0000">BB bets $14</font>, <font color="#cc0000">Hero raises to $48</font>, BB calls.

River: 9[img]/images/graemlins/club.gif[/img] ($113, 2 players)
BB checks, <font color="#cc0000">Hero bets $???</font>

I think it's it's fairly certain that a) I'm playing for value here and b) villain has a J c) distant chance is him having a flush. How much to bet? Villain hasn't been in the table for long, he killed some 50 BB stacks with TPTK type of hands - hasn't really gotten out of line this far, but I dunno what he'd be potting this turn with and calling a raise that I didn't have beat. So... He's been fairly active preflop though - It was 3-handed for most of the time and he opened OTB a lot.