The Cirque Du Freak series by Darren Shan. No where near as good as Twilight, (what is?
) but very good. a twelve book series, but the BOOKS ARE VERY SHORT!!! Soon to be a major motion picture!
If you enjoy those books, Darren Shan is also writing the Demonata series. Most disgusting books ever.
If you like a lot of horror, read the Demonata books. If you like minimal horror, read the Cirque du Freak books. (Which involve vampires.)