Mine is Berserk. Some have tried to unseat it as my favorite (Bleach, Deathnote, DBZ) over the years, but Berserk still wins in my book, even if it's dated. Berserk is beautiful and inspirational, then it turns dark and leaves you cursing at the insane cliff hanger. Few stories have elicited as much emotions in me as this one anime.
I cannot believe I forgot to add Ninja Scroll. Ninja Scroll is one of the best anime movies I have ever see. Absolutely on the top of my list! If you have not seen it then see it! I think it is on Netflix still.
You're the second or third person that has recommended that movie to me. I need to look it up.
it is really worth it, great characters and storyline!