Konjiki no Gash Bell, for it was the one that really got me started watching anime... Though, I started out in dubbed, known as Zatch Bell, but there were eventually no dubbed episodes, so I started subs. In about the 60s, I saw a dubbed episode, and I realised how terrible dubs can be. So, I eternally switched to subs.
FullMetal Alchemist will always be a favorite, Brotherhood maybe even more (when I finish it... lol), wonderful anime.
Bleach, one because it's rather long, and two because I just find it a great anime.
InuYasha, for I've been exposed to itfor years. Being that I've always known it in dubbed, I decided to make an exception, and around episode 127 I think, I lost interest and dropped it. Though, I may pick it up again after I finish FMA: Brotherhood and then Excel Saga.