The problem with most PC's are that they aren't designed to fit with home living. Most of them are actually darn right ugly black or silver plastic boxes. Samsung, Vizio and Apple seem to be the only ones that can design good looking PC's.
Gtek from bit-tech forums made a computer from scratch, now most people can do that right, but his computer was designed for his living room. He didn't tell of any specific specs but it's not made to be the most powerful computer, just one for general use.
The base of it is made from metal which he painted black. On top of the metal he then added some walnut, something which I have seen no computer manufacturer ever use, but looks gorgeous. The end product is beautiful and you'd never think it was a PC at first.