I think you could approach that nav a lot better. Perhaps you could use the same gray top shadow that you used on the forumbit and the sidebar to extend above the header and work in the nav somehow with that.
You did a good job. It looks nice! One thing that bothers me is that it seems cluttered, probably due to all the Wii replica in the header. The navigation could be better, too.
I guess it helps when I go back and measure to see if everything is in line and centered, my header was off by 15px and I lined everything up underneath it based on the header