Black Friday is almost here. The big corporations of this world are starting to foam at the mouth at the thought of astronomical holiday sales. Let's be honest, we're going a little rabid ourselves. This guide will get you started on an enviable computer with huge potential for expansion, and with Vista looming, you'll be glad you made room for it. This price guide is aimed squarely at the price-conscious DIY system builder, with a budget set at $800.