Overzealous steal, what to do postflop?

[damaniac]

Villain (and blinds) are pretty tight, no real read on their aggression as of yet, appears reasonable thus far.

I raise in the CO with J7 [img]/images/graemlins/spade.gif[/img] (a bit much maybe), Button 3-bets me, blinds fold, I call, HU for 7.4 sb's.

Flop is J43, two [img]/images/graemlins/heart.gif[/img]'s, I don't have them.

Check/bet/call.

Turn is a 9 [img]/images/graemlins/heart.gif[/img], putting the feared 3-flush out there.

Check/bet/call.

River is 6 [img]/images/graemlins/spade.gif[/img] . I bet, intending to fold to a raise.

Absent a read that he can fold a hand easily, any reason to c/r the turn? Or bet/fold it (I don't know that he won't raise AK with A [img]/images/graemlins/heart.gif[/img] here or something)? I figured bet/fold was best on the river since he may call with UI AK/AQ hoping I am bluffing, and won't raise without the goods.