200nl - How much do i bet on river

[Readzie]

villian is 24/17/1 (70 hands)
hero is 17/15/3.5 (on this table)

Party Poker, $1/$2 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

BB: $402.17
UTG: $56.66
MP: $215.42
CO: $352.70
Hero (BTN): $246.20
SB: $227

Pre-Flop: 7[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/spade.gif[/img] dealt to Hero (BTN)
UTG folds, MP calls $2, CO folds, <font color="red">Hero raises to $8</font>, SB folds, BB calls $6, MP folds

Flop: ($19) 7[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">BB bets $10</font>, <font color="red">Hero raises to $40</font>, BB calls $30

Turn: ($99) 4[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">BB bets $40</font>, Hero calls $40

River: ($179) J[img]/images/graemlins/diamond.gif[/img] (2 Players)
BB checks, <font color="red">Hero bets $100</font>,

i decided on 100, what would you bet and why. We obv cant check here vs an unknown player,

i felt 100 was the smallest amount i could bet and get him to fold queen or lower.