a 200-400 AK hand

I am asuming you DON'T have the K[img]/images/graemlins/heart.gif[/img]

I like to bet the fop since there are a LOT of draws on this flop (FD, GSSDs) and also get a sense of where I am at.

On the turn I like the idea of c/ring AI if you KNOW he will bet. If you lead here your line looks VERY suspiscious.

On the river just remember you checked three streets. You can have ANYTHING. I wouldn't be suprised if he bluffs here with air but then again it could also be the nuts.

I'd flip a coin and call/fold.