These are series I've seen and plan to purchase when and if they become available in the US.

Buy List Rating
Silent Möbius (manga)
REC (manga)
Princess Resurrection (manga) Very good
Omamori Himari (manga) Very good
Mobile Suit Gundam: École du Ciel (manga) Very good
Melty Blood (manga) Very good
Kure-nai (manga by Y. Yamamoto) Very good
Higurashi no Naku Koroni (manga)
Highschool of the Dead (manga)
Gunsmith Cats (manga)
Ghost Talker's Daydream (manga)
Fate/stay night (manga) Good
Elfen Lied (manga) Very good
Dogs: Bullets & Carnage (manga) Excellent
D.Gray-man (manga) Very good
Claymore (manga) Excellent
Bunny Drop (manga) Very good
Blade of the Immortal (manga)
Black Lagoon (manga) Excellent
Black Bird (manga) Very good