Oh, I read back now and understood the question XD
From the four water starters I'd pick... um... argh. It's hard. Probably Mudkip still. Only because Swampert is so pwnsome. But I like Totodile's and Feraligatr's design best, as I usually like Johto pokémon best ^^
The water typed introduced in Johto weren't all cool though... Quilfish was meh. And Mantine was huh. As for Wooper and its evolution, I used it in a really good team once, in Gold~ But they look bleh.
Politoad is love though~<3
What do you guys think about the Johto water types?