help me choose the bet size - nl400

[n1nj4.br]

I've been playing a solid TAG game this session. Dont getting out of line, neither has villian (30/21/3 over a good sample). We still didnt play any big hand, and i have not been floating a significative ammount.

Party Poker
No Limit Hold'em Cash Game
$2/$4 Blinds
6 Players
LegoPoker HH Converter

SB: $394.50
BB: $469.00
UTG: $394.00
MP: $1,042.40
CO: $498.28
<font color="black">Hero (BTN): $658.90</font>

<font color="black">Preflop:</font> Hero is dealt Q[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img] (6 Players)
UTG folds, <font color="red">MP raises to $16.00</font>, CO folds, Hero calls $16.00, SB folds, BB folds

<font color="black">Flop:</font> ($38) J[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">MP bets $26.00</font>, Hero calls $26.00

<font color="black">Turn:</font> ($90) 9[img]/images/graemlins/diamond.gif[/img] (2 Players)
MP checks, <font color="red">Hero bets $80.00</font>, MP calls $80.00

<font color="black">River:</font> ($250) A[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">MP bets $125.00</font>, Hero?