I don't normally like dark sites with lighter tech but I like the gray and bluish combination!
As your forum is just starting out you may want to reduce the number of sections you have. It's better to have a few sections with many posts than lots of sections with just a few posts in each.
I think you need a better header/logo... something that reflects the
cool look at nature of your site! The boxes just don't do your site justice!
Good luck with it! It looks like you're on a good road!
Lyte