633 3rd Avenue @ 40th St.
This spot is all sleekness and glass, with whole fish on ice at the big bar, and specials chalked on a board. The daily specials are, in fact, the only thing that varies from its other locations; there are four types of oysters every night and two types of clams, and the grilled seafood and steamed lobster are always great. Sunday and Monday it's a New England clambake, with a lobster and all the fixings. Professional service makes it a real New York kind of experience.