Fullmetal Alchemist: Brotherhood.
While I maintain it doesn't own me the way the first FMA anime does, this one does have certain charms of its own; I just don't like the pacing of the earlier episodes (I'm more than half way through) and well...I still like FMA better, lol.
But, like I said, this one is growing on me, in its own way.
(I also maintain that this is proof that adhering more to the manga storyline doesn't automatically equal "better". Or so I've heard Brotherhood is more true to the manga; I've never read it.)