Another vote for Pepe's/The Spot white clam apizza. Their other (red) pizzas are good, but I've had as good or better in New York, Italy, or elsewhere. There's something about the white clam apizza, though, that has convinced many a native New Yorker that the best pizza is not in New York, but in New Haven.
Sally's is garbage, though, and should be served at the kid's table with the Pizza Hut and the Chicago pies.
(Only half joking.)