One Peice is really cool But i havent even finished season one so.....
Black Butler, Angel beats, just restating what others have said, but also my pesonal opinions.. :P and OMFG Inuyasha is the bestest ever. :D
Ouran HSHC which uve seen, Soul eater, Shugo Chara which uve also seen, and this one is kinda awkward with a lot of bad scenes but junjou romantica, and yeah Death Note. :D
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Inuyasha, Soul Eater, Fruits Basket, Vampire Knight. Those are all pretty good.
D. Gray-Man, El Cazedor De La Bruja (not sure I spelled it right xD), Blue Exorcist, Big Windup, and Full Metal Alchemist ... they're all Animes I've watched and enjoyed
Watch Elfen Lied, Angel Beats, Fruits Basket, Gunslinger Girl, Noir, Baka And Test Summon The Beasts, Black Butler, Rosario+Vampire and Kaze No Stigma. They're all great
You should see Ghost Hunt! (Detective, Fantasy, Horror, Shoujo) 25 episodes
Oh of course Detective Conan (Action, Adventure, Comedy, Drama, Horror, Mystery) but it's a very long anime. Plus its old school. 698 episodes
Plus Detective Conan also has some movies and you could see it in live (by "live" I mean people act in out) from too.
I just finish Jigoku Shoujo (Hell Girl) It is one of the top ones in my list.
(Horror, Mystery, Psychological, Revenge, Supernatural, Thriller, Tragedy)
This anime as three season. Each season 26 episodes.
1) Jigoku Shoujo
2) Jigoku Shoujo Season Two
3) Jigoku Shoujo: Mitsuganae
If you more into romantic ones:
Peach Girl (Comedy, Drama, Romance) 25 episodes
Kare Kano (Comedy, High School, Romance, School Life, Shoujo, Slapstick) 26 episodes
About Kare Kano, it's very old school :)