Nande! None of you mentioned "Serial Experiments Lain"!? That would be my all-time favorite Anime!
I generally prefer to listen to, or read, everything I like in their original tongue. Especially with something so dear to me as SEL. From Appleseed (Ex Machina), to the first Final Fantasy movie, to Macross Frontier, I've always loved the way Japanese sounds! But Lain is actually the foremost reason I want to learn Japanese. I know, it's probablty not considered the most elevated reason for wanting to learn Japanese. But... hidoi-ne!
Gonna do it anyway!
I'm actually not a real Otaku: I don't watch everything there is to see, and I still haven't seen a single episode of Naruto Shippuuden.
Don't need to, either. There's a few good shows out there, like Lain, or Ergo Proxy, and some seriously styllish Anime movies, like Final Fantasy VII: Advent Children and such. And that's good enough for me.
I only discovered "Serial Experiments Lain" a month ago or so (shows how much I'm behind the times, LOL). And I can tell you, whatever your personal feelings may be with regard to Anime, nothing motivates like being able to watch your favorite show, and every day be able to understand a little more!