[queentess]

Brian Lumley! Specifically, his Necroscope series. Errr, I think it's appropriate for a 15 y/o, but you may want to check it out for yourself. I was reading Lumley alongside Stephen King when I was about 15.

Speaking of King, Salem's Lot is pretty good. Eyes of the Dragon is another of my favorites, though that one doesn't involve vampires. He may also like the Dark Tower series.

I also recently read the book Feed by Mira Grant (zombies, not vampires, but I assure you that both appeal to a similar demographic). It was highly imaginative, but it was also a bit too gung-ho stick-it-to-the-man preachy for me. Probably would have appealed to me more when I was younger, especially with the huge emphasis on blogging.

And if he happens to like zombies, he MUST read World War Z by Max Brooks.

I've heard fantastic things about Strain by Guillermo Del Toro (vampires), but I haven't yet read it, so I can't vouch for it.