What are some good Mangas
Genres maybe horror action shojo comedy fantasy supernatural
One of the best mangas to read is One Piece. Other great ones are Naruto, Magician, Heart of Thomas, Shonen Jump Alpha, Soul Eater NOT and the Attack on Titan. You can get more on http://manga.about.com/od/recommendedreading/tp/2012-Preview-25-Most-Anticipated-Manga.htm.
D.Gray-Man is perfect and it's the best manga I've read and best anime I've watched. Also try reading Blue Exorcist (Ao no Exorcist), Bleach, Battle Royale, Fullmetal Alchemist, those are some I've read and I've found awesome.
I can't really help you unless you're into yaoi, in which case I can recommend some good ones.
D. N. Angel