That's a good point. If you can find a barebones machine with the motherboard,
psu, and
cpu already installed, then all the hard work is done for you. Then all you do is throw in the video card, memory, hard drive.
However, I just checked Newegg and they have a terrible selection. And I don't think they come with the
cpu. I don't really shop anywhere else, so I wouldn't be able to recommend where to get a good barebones unit from.