Concealed 2-pair -- bet this river?

[VarlosZ]

PartyPoker $2-$4 NLHE, 6-Max. We're 4-handed, everyone's got ~$400 in chips. This is my 3rd hand at the table, and I don't recognize the players in the blinds.

I've got 8[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/club.gif[/img] on the button. UTG folds, I raise to $12 (for stealing/meta-game purposes, of course; not my standard play). SB calls, BB calls.

Flop (pot = ~$34): 6[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/club.gif[/img]

SB checks, BB bets $30. I call, SB folds.

Turn (pot = $94): 7 [img]/images/graemlins/spade.gif[/img]

BB bets $75, I call. I merely called these two streets in order to induce future bluffs (or bets from a medium overpair), and also to avoid a reraise which would put me in a tough spot (this would not be an unreasonable way for villain to play a set of 3s, and the turn completes some straight draws). I feel it was the correct play here, but I'm open to criticism.

River (pot = $244): A [img]/images/graemlins/heart.gif[/img]

BB checks. Hero . . . ?