Not sure where to put the PC tower? How about in the desk? Power Desk is a UK company that has integrated a Dell PC into a line of sleek looking desks. Everything that you need regular access to (power switch, USB ports, headphone and mic jacks, dvd drive) is all located front and center without messy wires or the need to crawl under your desk.
Not sure what this kind of setup means for upgradability but it sure makes for a nice, minimal looking desktop PC setup.
Pricing for the different models (in British pounds) is available here.
-via Born Rich