I think my avatar speaks for itself.
I like the Inuyasha anime style - it has cleaner lines and a sharper feel, compared to the Takahashi manga style. It's still a little rough compared to some of the other stuff (like say, CLAMP) but it has its own appeal.
Groove Adventure RAVE has an interesting big-eyed style for its main characters as well, though one wonders what stuff the artists doing all secondary characters are on. You'll know what I mean if you've seen this one.
Gonzo Digimations Full Metal Panic is also quite exemplary, although there are instances where they've slipped up.
Art styles I don't really like? One Piece is strange, and the whole Revolutionary Girl Utena/Fruits Basket style is a little too angular (though the latter is quite watchable).