nl600 set of 7s meets an action killing river

[fisherman112]

no real reads on villain since i havent seen any showdowns, but seems solid.
6 handed (3/6)
villain 1200
hero 1000, in cutoff with 7 /images/graemlins/spade.gif7 /images/graemlins/club.gif

villain opens for 20, hero calls, bb calls

flop: Q /images/graemlins/heart.gifT /images/graemlins/club.gif7 /images/graemlins/diamond.gif (pot 60)
bb checks, villain bets 35, hero raises to 100, bb folds, villain calls

turn: 6 /images/graemlins/diamond.gif (pot 260)
villain checks, hero bets 150, villain calls

river: 9 /images/graemlins/club.gif (pot 560)
villain checks, hero ???

during the hand i had no idea what to do here. my read had him on AQ or KK but i wasnt sure if he would call another bet and i really didnt want to let him c/r all in.
now i think i should have made a weak bet of 100-200 to price him in or induce a bluff. thoughts?

[flawless_victory]

bet as much as you think he can call.
checking behind here is criminal.

[Jeff W]

Why did you bet so little on the turn?

[kagame]

huh?

you arent losing to anythink but KJ or maybe something like T8d

just bet like half the pot, hes not folding two pair

[AZK]

I wouldn't exactly call this an action killing river...maybe a 9 /images/graemlins/diamond.gif