Looking for some insight since I can't possibly read everything out there in the Sci-Fi/Fantasy genre (at least without book holding hand cramps).

Is there anyone out there who avidly reads anything that involves vampires in the plot or as main characters?

I'm asking because I have a story idea and I need to know that I'm not inadvertantly ripping someone off with the story I want to write.  My previous graphic novel idea was eerily similar to The Cell, even though I came up with the idea a year before the movie came out.  *grumbles*