Semi-Bluff Called, Now What?

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200 full ring, folded to button ($190)who open limps. Villian($220) in sb raises to $8, I (cover) call in bb with 6 [img]/images/graemlins/diamond.gif[/img] 8 [img]/images/graemlins/diamond.gif[/img]

Not many reads on the players thus far. I havent noticed anything particularly good or bad about villain, button's open limp says he's not so good.

Flop ($21) 4 [img]/images/graemlins/diamond.gif[/img] 5 [img]/images/graemlins/spade.gif[/img] 3 [img]/images/graemlins/spade.gif[/img]

Villain leads for 16(seems standard), I call with open-ender, button folds.

Turn ($50) 3 [img]/images/graemlins/club.gif[/img]

Villain leads out for $20 into me. I think he's weak or scared of my hand, so I punch it up to $60. Villain calls that bet.

River ($170) brings the 4 [img]/images/graemlins/spade.gif[/img]

Villain has about $140 left. He checks. Hero?