I am doing a multi-zone system with a digital drive, receiver, blu-ray player, Cable box and would like to fit some content onto a shelving system in my den that doesn't take up too much floor space, but have quite a bit of wallspace. TV's for the system will be mounted separately. What are some of the best options. Sliding doors would be preferable to swinging, glass, so I can see that my system is working properly without opening. I want something enclosed.