NL50 - boat up on the river - betsizing

[Everlong]

I am certain I have the best hand. What is your bid here regarding river bet and why?

I have some ideas of my own here but I'd like to see what you guys think first.

Poker Stars
No Limit Hold'em Cash Game
$0.25/$0.50 Blinds
6 Players
Lego Poker Hand Converter

<font color="black">Stack Sizes</font>
<font color="black">SB: $54.90</font>
<font color="green">Hero (BB): $50</font>
<font color="green">UTG: $44.25</font>
<font color="black">MP: $50.75</font>
<font color="black">CO: $61.90</font>
BTN: $48.25

<font color="black">Preflop:</font> T[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/spade.gif[/img] ($0.75, 6 Players)
UTG calls $0.50, MP calls $0.50, CO calls $0.50, BTN folds, SB calls $0.25, Hero checks

<font color="black">Flop:</font> 2[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/heart.gif[/img] ($2.50, 5 Players)
SB checks, <font color="red">Hero bets $2</font>, UTG calls $2, 3 folds

<font color="black">Turn:</font> Q[img]/images/graemlins/club.gif[/img] ($6.50, 2 Players)
<font color="red">Hero bets $4</font>, UTG calls $4

<font color="black">River:</font> T[img]/images/graemlins/spade.gif[/img] ($14.50, 2 Players)
<font color="red">Hero bets ?