100-200 Live: Thin River Value Bet?

[FoxwoodsFiend]

Got some mixed advice on this one from various posters so figured I'd post it for discussion's sake. 100-200 NL, effective stacks 60k. Villain is a mid-20's or so internet player from the Bay Area but wouldn't give his sn to the guy sitting next to me. All I know about him is that he wanted to play the 500-1k NLHE/PLO game in Bobby's Room but couldn't get a seat, so he's probably pretty good.

Anyway, he had been playing very aggressively and I have a somewhat LAGgy image. Two relevant hands: he raised in EP I reraised OTB to 5400 and he called. The flop came down A [img]/images/graemlins/spade.gif[/img] J [img]/images/graemlins/spade.gif[/img] Q [img]/images/graemlins/spade.gif[/img] and he checkraised my 3k c-bet to 10k and folded to my shove for 25k or so more. I showed the T [img]/images/graemlins/club.gif[/img].

Another hand I raised UTG and he repraised OTB to 2400, I 4bet him to 12k and he laughed like he couldn't believe this sick spot and folded.

Anyway, onto the hand: I raise UTG+1 to 700 with A [img]/images/graemlins/heart.gif[/img] 2 [img]/images/graemlins/heart.gif[/img] folded to him in the SB and he reraises to 2400, I call. Somebody makess some idiot live comment like "you guys just want us to clear out and you two can play HU all the time? We're just getting in the way!" Nobody laughs.

Flop (5000): K [img]/images/graemlins/spade.gif[/img] 4 [img]/images/graemlins/spade.gif[/img] 5 [img]/images/graemlins/diamond.gif[/img]
He bets 4k and I float it.
Turn (13000): 9 [img]/images/graemlins/club.gif[/img]
He looks at me, thinks for 15 seconds or so, and checks ina weird way (with his arms crossed, he taps his rib cage) while staring at me. I go "you check?" he says "yeah" and I think for about 5 seconds and bet 8k. (should probably have bet 10k but there were some logistics with my chips and I just decided 8 should do it).
He calls after just a few seconds of thought.
River (29000): A [img]/images/graemlins/diamond.gif[/img]

We each have 45k behind. Who checks? Who bets? If you bet, how much?