Rivered 2nd nuts OOP. Value bet?

[lacrymosa]

100BB stacks. Ordinarily I'd fold this hand to a raise OOP, but this guy raised any 2 cards from CO/button when folded to him, so I felt I could defend my blind. I was fairly certain I was ahead on the flop, and I checked the turn for some pot control. What is hero's line on river? If I bet, is only an ace [img]/images/graemlins/heart.gif[/img] going to call?

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.10/$0.25
5 players
Converter

Pre-flop: (5 players) Hero is SB with K[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/spade.gif[/img]
UTG folds, <font color="#cc0000">CO raises to $1</font>, Button folds, Hero calls, BB folds.

Flop: Q[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/club.gif[/img] ($2.25, 2 players)
<font color="#cc0000">Hero bets $1.8</font>, CO calls.

Turn: 6[img]/images/graemlins/heart.gif[/img] ($5.85, 2 players)
Hero checks, <font color="#cc0000">CO bets $3</font>, Hero calls.

River: 2[img]/images/graemlins/heart.gif[/img] ($11.85, 2 players)
Hero ?