I like the concept of your forum alot. As popular as supernatural/horror movies are, there hasn't been a forum on them.
I like your header image alot, only it leaves alot of white space on either sides. Don't like that part of it.

When I first view the header, I don't get the impression you'd have a grey style. I'd say match your style colors with your image colors. It will give off a much better effect in the end.