NL 100 - Turn action???

[solvine]

Full Tilt Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 9 Players - (LegoPoker Hand History Converter)

SB: $85.50
BB: $17.75
Hero (UTG): $100.65
UTG+1: $98.30
MP1: $115.70
MP2: $64.20
MP3: $140.00
CO: $98.50
BTN: $50.70

Preflop: Hero is dealt K[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img] (9 Players)
<font color="red">Hero raises to $3.50</font>, 3 folds, MP3 calls $3.50, CO folds, BTN calls $3.50, 2 folds

Flop: ($12) 2[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img] (3 Players)
<font color="red">Hero bets $9.00</font>, MP3 calls $9.00, BTN calls $9.00

Turn: ($39) 6[img]/images/graemlins/diamond.gif[/img] (3 Players)
Hero ???


MP3 is new to table so stats are 18/7 after 15 hands
BTN is also new, 55/7 after 20 hands

If i bet how much shall i bet??
I assume one has FD, other either has the six or random pp

mor ei think about hand i think a bet of $25 and b/f line would be best??