I, too, like the long novel. I have read several long novels like you seek (except no vampires either -- I really dislike paranormal, romance, vampires). The problem is that they are usually incomplete in that they are a part of a series and you really need to read the series. A good example is the Phoenix series by
Richard L. Sanders. Each book ran 800+ pages but even with 3 books published, the story is incomplete. If you want to check it out, the first book,
The Phoenix Conspiracy, is free. I found the books to be very good but frustrating that none of them are a complete story.