It really depends on the types of seafood, and how you like it prepared. If he likes steamed crab, lobster, etc, then I would recommend Fultons. Unfortunately, and I don't understand why, Fulton's seems to get a bad rep on these boards, but we have eaten there several times and had great service, and the food, although expensive was well worth it.
Our other favorite is Narcoosee's. There you can get food other than seafood, and DH is bound to find something there to his liking! The service is really good, and the view of the MK is gorgeous at night!
Whatever you decide, have a great time!