A spot that always gives me trouble

[aislephive]

Villain is 40/16 and plays a fair amount, I'd consider him a regular (obv terrible though). He is pretty laggy and usually aggressive in general, but my general impression is that he plays passively against me. I got my stack earlier when I raised on the button with A2s, he called in the SB and a tag squeezed in the BB. I shoved and sucked out on the tag's JJ.

The turn check is standard for me. I hate to bet and get raised, and I can safely c/c with the overpair + redraw and re-evaluate on the river. Plus I'm usually WA/SB in this spot. The river is a very confusing spot though, and I can't decide if c/c or b/f is better (of course depending on certain variables occasionally c/f or b/c). For those of you in the bet camp, how much and what is your reason for betting as opposed to checking?

Party Poker - No Limit Hold'em Cash Game - $2/$4 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $380.00
BB: $650.90
Hero (UTG): $873.30
MP: $434.74
CO: $392.00
BTN: $987.20

Preflop: Hero is dealt Q[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/club.gif[/img] (6 Players)
<font color="red">Hero raises to $16.00</font>, MP calls $16.00, 4 folds

Flop: ($38) 4[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $30.00</font>, MP calls $30.00

Turn: ($98) J[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">MP bets $72.00</font>, Hero calls $72.00

River: ($242) 3[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero ???