My suggestion (Disclaimer: saw this in a magazine, dont flame me)
Go out to the hardware store, spend $20 on a dremel tool, and $20 on some plexiglass, and make a clear case to house your pc in, this way it wont get dusty.
Second suggestion, hang it on your WALL, this way:
1: People will see it
2: You wont have to stand on a chair every time you need to load a cd/ floppy/reboot it
3: It's going to be much safer to mount it on the wall
4: If your PC falls off, theres less of a chance of it breaking, and less of a chance of landing on someone's head
I think i speak for all of us when I say we've all been in that "PC falls off ceiling, gives friend concussion, friends parents sue u 2 pay 4 hospital bills" Its ugly. Dont wanna go there.