Gankutsuou
24 Episodes long and futuristic retelling of the French Classic, [u]Count of Monte Christo[/u]. The story revolves mainly around Albert, a naive teen who is taken under the wing of the mysterious Count of Monte Christo. It's a very dramatic and emotional series as the dark secrets behind several aristocratic families come into play, including the betrayal of Edmond Dantes by his best friends that has changed him into the vengeful, supernatural Gankutsuou. The animation is beautiful, but at times hard on the eyes. This anime tops the list of my favorites. Here's a better review than I could write out. And whatever he says, I definitely like the original Japanese dub with english subtitles way better. Oh yeah, did I mention it was futuristic with luxury vacation spots on the moon and deuling gundam-style in giant suits of classic looking armor and giant swords?
http://www.youtube.com/watch?v=vGPPBY6xHUg