I'm in search of a tall shelving unit (with at least 4 shelves) that I can use to house some network equipment (2 switches, firewall, etc.), a Cube mATX chassis or two, and various other parts. All the shelving units I've seen that can hold any kind of weight don't have solid shelves. I want to easily be able to place devices with feet on these shevles. I'll also need to be able to screw the unit into the wall for extra support. What are some of you using in your homes?