I really liked "Baccano!" (which is only 13 episodes, OVAs aside.) One Piece is pretty good, except that the fights take forevvvver. I dunno, I wouldn't watch a lot at once, or it feels like a slog. Fairy Tail is quite good, (manga) and as a warning, I've heard that the dub for D. Gray Man is sort of horrible. Just thought I should say.