400NL - Please school me on the river c/r bluff

[Mossberg]

I'm just moving up from 200 where I crushed the games playing a pretty straightforward 19/16/4 style. I'm realizing that I need to start adding some new tricks to my arsenal if I expect to make cake at 400. So I've been thinking alot about checkraising the river more, both for value, and as a bluff.

villain is playing a very LAG game, running @ 34/25/4 over 240 hands. I'm not sure how much it matters over a smallish sample, but his wtsd is only @ 11%. I haven't decided if he's a good/great/bad LAG yet. I think he probably sees me as kinda nitty, but aggro and solid.

So is this a good spot for a c/r bluff? Why, or why not? I feel like it is for a couple reasons - mostly because of my image, and the fact that it's unlikely he can have a king strong enough to stand a c/r here.

Blinds: $2/$4
5 players
Converter

Stack sizes:
UTG: $348.10
Hero: $394.00
Button: $1.239.05
SB: $306.20
BB: $569.70

Pre-flop: (5 players) Hero is CO with 9[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/diamond.gif[/img]
UTG folds, <font color="#cc0000">Hero raises to $16</font>, Button calls, SB calls, BB folds.

Flop: 4[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/heart.gif[/img] ($52, 3 players)
SB checks, Hero checks, Button checks.

Turn: K[img]/images/graemlins/spade.gif[/img] ($52, 3 players)
SB checks, <font color="#cc0000">Hero bets $36</font>, Button calls, SB folds.

River: 7[img]/images/graemlins/spade.gif[/img] ($124, 2 players)
Hero checks, <font color="#cc0000">Button bets $100</font>, Hero pulls the trigger, or gives it up?