One, Two, Three Stabs your out?

[arod15]

1-2NL AC Effective Stacks 500
Hero is in the BB with K [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/spade.gif[/img]
4 to the flop.

Flop is K 2 9 one spade
Hero checks
MP (a LAG bets out a lot) bets 15 fold, fold
Hero check-raises to 50, after hesitation Villian calls
Turn is 6spade
Hero bets 100 Villian heistates a long time and calls
River is a 5
Whats your action here? Should i push? Bet 200? Check fold?
My guess is villian is on K10 or KJ or perhaps a weaker K.
Also what about my flop and turn play? I think I should have bet more on that turn to get him off successfully?
Thanks in Advance