What should I read to continue my strange recent obsession with love stories involving vampires?

In the past 2 months, I've read the entire Twilight Saga and Stephenie Meyer's The Host, Jeaniene Frost's A Night Huntress Novels (reading the last 1 now), Christopher Moore's You Suck (not my fav). I took breaks in between time and read a few Zane and Eric Jerome ey (he's 1 of my fav) books. I'm just in love with reading about underworlds, alternate worlds, and strange means of existence. Help! Must find book 13!