I build my own, far more control over the process and not at all difficult i.e. if you were any good at lego this isn't much different. It's hardly a masterclass in electronics, these things are done before they're even out of the box- The real art is in the shopping list, good decisions on what you want and can live without can save hundreds, a bit of forward thinking too helps, e.g. AMD are cheaper, and they're kinder to the people who wish for backward compatibility, whereas intel almost make a new socket each time, are pricey, but top end intel will tear up any AMD competition. A lot of the traders on here like multi screen too, I have three but I cheat as it's over two machines with synergy linking them up. Graphics cards with 2 outputs usually pretty cheap off ebay, unless you're a gamer, in which case, it's the most important and expensive part of your rig