KQs river value bet?

[Captain Morgan]

Live 8/16 loose-passive game. 3 call, I raise K [img]/images/graemlins/spade.gif[/img]Q [img]/images/graemlins/spade.gif[/img] on the button. Both blinds and limpers call.
Flop: J [img]/images/graemlins/diamond.gif[/img]T [img]/images/graemlins/club.gif[/img]7 [img]/images/graemlins/heart.gif[/img]. SB checks, BB bets, 1 call, 2 folds, I raise, SB folds, other two call.
Turn: K [img]/images/graemlins/heart.gif[/img]. Check, check, I bet, both call.
River: 8 [img]/images/graemlins/spade.gif[/img]. Check, check, I...?
BB will bet top pair, AT, or straight draw, and other caller is calling down with any piece of it. They both think along the line of "he raised the flop, he might have a set, I better just call down with my two pair (either flopped or turned)", but they would also expect me to bet the river so they can check raise a made straight. Is the range of what I beat too small for a bet here? Do I play it safe or am I being a wuss and losing money by not betting?