Why pay outrageous department store prices for an all-in-one PC when you can simply purchase an ATX/Micro-ATX compatible computer case with a built-in mount for your LCD monitor? Actually, don’t answer that because you can’t actually buy the L-2000 LDorado (from Korean company 3RSystem) in the US.
The LDorado can handle monitors between 19 and 24 inches and features seven expansion ports, a DVD/CD drive slot, and front-mounted USB ports, audio jacks, and power button. I’ve no idea what this apparatus costs but if you’re one of those “determined” types, you might be able to build something like this yourself.