Lumley's Necroscope series is... different. Nasty, freaky, but good. For something a bit more modern, I'd look for Chris Golden's Shadow Saga, Richard Laymon's got one or two good ones (can't remember names for the life of me..). I Am Legend (Richard Mattheson) is arguably one of the best, and has an absolutely fantastic ending. Just don't watch the movie first - it's very different, good in a completely different way, it just isn't the same sort of story at all. If you're into comics, 30 Days Of Night (and its sequels) are fantastic, and if you can find it, Ultraviolet (the TV series, not that awful movie), while slightly dated now, is still hands down the best modern interpretation of vampires.