Out of curiosity I downloaded the free trial and ran your index page and one of the other pages through it. You wouldn't have liked the result.
But as I've mentioned before, if you could reduce the contents of the right column, or even reduce the font size, the chunk below the horizontal line would be moved up somewhat, closing some of the white space. The advantage of that would be that the navigation would be visible without scrolling. Even if you have a large monitor, you don't know what equipment your potential customers have and what they are able to see. If I'm using my laptop, I can't see the navigation without scrolling.