Do you lay this down?

[BeavisChrist]

I've been agonizing over this one since Friday:

Local (Seattle) card room 3-5 NLHE.

Hero ($760)
Villain ($660)

Villain is in the SB, UTG totally wild LAG player raises to $15. I'm MP with 5[img]/images/graemlins/spade.gif[/img]5[img]/images/graemlins/club.gif[/img]. I flat call the $15 as does the button and SB.

Flop: K[img]/images/graemlins/club.gif[/img]6[img]/images/graemlins/heart.gif[/img]5[img]/images/graemlins/heart.gif[/img]

SB checks, UTG checks. I lead out for $30 (1/2 the pot). Button folds, SB check-raises to $60. I had him pegged as a somewhat reasonable player - but I had seen him check-raise like this several times during the night and take pots down uncontested. UTG folds, I flat call his raise, putting him on AK. $180 in the pot.

Turn comes J[img]/images/graemlins/club.gif[/img]. He leads out without hesitation with $100. I fire back and make it $200. He looks me over and says "I'm all in."

Dealer counts down and it's another $280 to call. The pot has $580 plus his $280 - $860 total.

Comments / suggestions at this point in the hand?