5/10 NL at Motor City Casino. My KK runs into heat 6-ways.

[flytrap]

I decided to break the monotony of my normal routine of 6-tabling 100nl online and headed to Motor City casino in Detroit for some 5/10 NL. Villain in this hand seems normal, a little too loose preflop, but I haven't seen him get out of line yet. I have around $1400 and villain covers. I probably have a somewhat tight image, but live people just don't pay attention.

There is a straddle to $20 and two folds, I make it $70 with KK. Villain is next and calls, 4 other people call. Live poker ftw.

Flop 3 [img]/images/graemlins/spade.gif[/img]3 [img]/images/graemlins/heart.gif[/img]7 [img]/images/graemlins/spade.gif[/img] Pot $420

I bet $250, villain snap-calls with 4 people behind him to act. All the other fold.

Turn 3 [img]/images/graemlins/spade.gif[/img]3 [img]/images/graemlins/heart.gif[/img]7 [img]/images/graemlins/spade.gif[/img]9 [img]/images/graemlins/diamond.gif[/img] Pot $920.

I check, villain insta-pushes, I have $900 getting 2-1.
My thoughts: I think villain is strong here most of the time. He called the flop bet with 4 people left to act. I'm not sure if he puts me on an overpair or not, but it's likely he thinks I have one since I led into so many people. I think he could have something like A3s, and is worried about me having a flush draw, or he could have a full house, but doesn't want a scare card to come and kill his action. A second best overpair is also a possiblity, as he may read my check as weakness, or he may just think he has the best hand with something like JJ. I think if I had AA I would easily call, since this lessens the chance that he has A3. What do you guys think? Call or fold?