AK: Check through the river?

[JKetzer]

So far GT+ stats are showing MP2 to be tightish (~25% VPIP) and passive over about 30 hands.

Party Poker 1/2 Hold'em (9 handed) converter

Preflop: Hero is MP3 with A[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">3 folds</font>, MP2 calls, <font color="#CC3333">Hero raises</font>, CO calls, <font color="#666666">3 folds</font>, MP2 calls.

Flop: (7.50 SB) A[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
MP2 checks, <font color="#CC3333">Hero bets</font>, CO folds, MP2 calls.

Turn: (4.75 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
MP2 checks, <font color="#CC3333">Hero bets</font>, MP2 calls.

River: (6.75 BB) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
MP2 checks, Hero...

If he's calling on a flush draw and I bet, then I figure he's probably going to fold. If he's calling down with a weaker ace, then he's probably going to pay me off. If he had KQ, then he's trying to check-raise another bet out of me.

Fire off one more value bet, or just check it through?