Getting as much value from KK vs Lagg as possible

3bet PF?
Bet less/check behind on river? (I think that'd be a huge loss of value if I checked)
Damn I should have raised the flop....why didn't I raise the flop??
If I raised the flop then I wouldn't have so much money left by the river...

So as played how's my river play?

GAME #461934429: Texas Hold'em NL $0.50/$1 2006-12-11 22:41:10
Table Rideau Carelton (6 max)
Seat 1: Herwan ($173.52 in chips) DEALER
Seat 3: cheeseweezle ($95.13 in chips)
Seat 5: djnutte ($54.15 in chips)
Seat 6: j0nnyb0y ($100.00 in chips)
Seat 8: elscorcho2 ($43.15 in chips)
Seat 10: ExtremitO ($54.25 in chips)
cheeseweezle: Post SB $0.50
djnutte: Post BB $1.00
*** HOLE CARDS ***
Dealt to j0nnyb0y :Ks: :Kh:
j0nnyb0y: Raise $4.00
elscorcho2: Fold
ExtremitO: Fold
Herwan: Fold
cheeseweezle: Raise $7.00
djnutte: Fold
j0nnyb0y: Call $3.50
*** FLOP *** :2s: :8s: :4s:
cheeseweezle: Bet $15.00
j0nnyb0y: Call $15.00
*** TURN *** :2c:
cheeseweezle: Check
j0nnyb0y: Bet $25.00
cheeseweezle: Call $25.00
*** RIVER *** :Jc:
cheeseweezle: Check
j0nnyb0y: Bet $52.50

i would raise flop because stupid people call with like AxQs

There already was a 3bet PF, when it gets back to you it would be a 4bet. Anyways, I think PF is fine because you really arent going to be balancing the 4bet with anything other than AA or KK so it would be incredibly transparent here. I agree with gabe about postflop, Id raise the flop and hope to get it on an the turn.