That's hard. The breed I'm most likely to get is a standard poodle. But I am deeply fond of and greatly admire German Shepherds. And the breed that if I see one is guaranteed to make me grin and exclaim to the owner in delight is a corgi. So . . . I'd guess I actually have to say Corgis (both types) . . . they just make me happy by existing.
Although there are other breeds that are more unique-looking, I have never had or known a better dog than my Labrador Retriever, so that's my pick. I am getting a Golden Retriever in the next 2 weeks, though, so I might have a tie.
Australian Shepherd for sure. Also on my top 5 are Rotties, BCs, Filas and shepherd mixes...yes the mixes. I'm not a fan of pure GSD's, but they make for some amazing mixes.