warped exhaust manifold

Thanks for all the replies. First time I've had the manifold off. It had a basic thin metal/composite gasket on it. I've heard that they didn't use gaskets from the factory. I think I'll see what some of those recommended shops say in the morning. If it's not too expensive ....
Otherwise finding a belt sander might be the way to go, or I was thinking the belt mounted to something and dragging it back and forth might be a good idea. That was an idea from one the machine shops I talked to too.
RemFlex says that their gaskets are good for up to a sixteenth, so maybe before going to a bunch of trouble maybe that could be worth trying first. Especially after hearing your review and another like.