Some faves of mine include...
-Chobits
-DearS (basically Chobits with aliens but it holds a very special place in my heart)
-.hack//Legend of the Twilight
-Juni Ito's Hellstar Remina
-Another
-Higurashi
-Umineko
-Dragon Half
-Crest of the Stars
-Angel/Dust (admittedly this is an old, obscure release that most won't be impressed by due to it having two under developed volumes but like DearS, it holds a very special place in my heart - and the art is amazing!)
-Magic Knight Rayearth
-Sakuran
It's a lot of sci-fi and horror!