You might also consider using a hooded pass through plate like the one shown here:
http://www.hometech.com/techwire/wallplat.html#VA-WPBWW
I used several of these in my equipment closet, and it is a perfect way to have a clean look without introducing any unnecessary connections between your display and your gear. With these plates, my speaker wire runs directly to my speakers with no breaks, my component/hdmi cables run directly to my projector from the source equipment with no breaks, etc. Using a plate like this also means that you only have to buy one cable instead of three (one from the source to the plate, one CL-rated cable inside the wall between the two plates, and a third cable to go between the plate and the display).
You can get a little better idea of what these look like if you take a look at the picture showing the back of my equipment rack in my theater picture page (in my signature).
jj
