NL50: River decision against possible floater

[Baintz]

Hero has been TAG, only gone to showdwon once, where I showed a good hand. Villain has raised a couple of my cbets, and possibly floated a couple of times where I gave up with junk on turn. I get the feeling he may be playing back at me.

Party Poker, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

CO: $74.26
BTN: $58.60
SB: $52.49
BB: $48.08
Hero (UTG): $54.02
MP: $63.37

Pre-Flop: A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/heart.gif[/img] dealt to Hero (UTG)
<font color="red">Hero raises to $2</font>, MP folds, CO calls $2, 3 folds

Flop: ($4.75) T[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $3.20</font>, CO calls $3.20

Turn: ($11.15) A[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $6.50</font>, Hero calls $6.50

River: ($24.15) K[img]/images/graemlins/club.gif[/img] (2 Players)
Hero ???

I checked turn to keep pot small in case he has a T or just made the straight w QJ, and also to allow him to bluff, as a bet here folds out pretty much everything I beat, unless he floated with a worse A.

Am unsure about river. If he has a straight or a T I may lose value if he checks behind, but then leading out denies him the opportunity to bluff. Maybe bet small and hope to induce a raise?