Zatch Bell and One Piece are horrible American wannabe animes. If you like those than you truly have no taste for the actual work.
Cowboy Bebop, Love Hina, Neo Genesis Evangelion, all classics. These 2 series are complete jokes.
What do you classify as anime? Because One Piece was animated by a Japanese company (Toei) and based on a Manga.
Anyway, One Piece is the best shounen imo, and the end of Enies Lobby arc was sad =[