So Fevre Dream is good? I looked at it and almost grabbed about a hundred times... I love Martin, he's one of the best writers I've come accross, but I was a bit frightened by the prospect of a vampire book from him and was hesitant to read it because I thought it would shatter my opinion of him.
If you've never read anything else by Martin, do so; he's great. I'll be picking this one up based on your recommendation, so thanks march.
(Have you picked up any Tom Holland books? Lord of the Dead is a great novel of the vampire genre; the writing is almost poetic which is sort of fitting seeing as how the protagonist is Lord Byron)