River question

[Lunar Tweak]

it's 6 handed game, Villan #1 in SB is somewhat of a calling station, but will let you know when he has a made hand. and villan #2 loves to pump the flop w/ draws. the main question is on the river, but i'll explain my thought process throughout the hand.

i open raise 7 [img]/images/graemlins/club.gif[/img]6 [img]/images/graemlins/club.gif[/img] UTG+1 and the blinds call.

Flop (6sb) 3 players
Q [img]/images/graemlins/diamond.gif[/img]7 [img]/images/graemlins/spade.gif[/img]3 [img]/images/graemlins/diamond.gif[/img]

checked to me and i bet. SB calls, BB raises, i 3 bet, and they both call.

they way they both called my raise made me think they were both on draws. possibly both diamonds, but SB could also have a gutshot.

Turn (7.5bb) 3 players
Q [img]/images/graemlins/diamond.gif[/img]7 [img]/images/graemlins/spade.gif[/img]3 [img]/images/graemlins/diamond.gif[/img] [J [img]/images/graemlins/heart.gif[/img]]

checked to me, i bet, both call.

i still feel i have the best hand.

River (9.5bb) 3 players
Q [img]/images/graemlins/diamond.gif[/img]7 [img]/images/graemlins/spade.gif[/img]3 [img]/images/graemlins/diamond.gif[/img] J [img]/images/graemlins/heart.gif[/img] [8 [img]/images/graemlins/spade.gif[/img]]

checked to me: bet or check?

if i bet, obviously i'm only going to be called if i'm beat. so even though i was fairly sure my hand was still best on the turn, i'm wondering now if betting has merit to fold something like the 8 [img]/images/graemlins/diamond.gif[/img]? especially if it's in the SB's hand, since he still may fear the BB having him beat anyway.

is this remote scenario worth risking another bet on the river, or should i check it down hoping my hand is good?

thanks in advance.