eMachine
i used to sell computers at Best Buy, and i honestly could never sell a person an eMachine with a good conscience (i felt bad afterward, lol) they are such crap, they use refurbished parts, and almost always have celeron processors, building your own computer is so awesome, it is nothing but advantages, because
1) you know the computer inside and out, if you have a problem you nkow how to fix it
2) its cheaper, you save so much money by building your own
3) you get better parts, as you can just save up and buy 1 or 2 parts at a time, as opposed to having to buy it all at once
4) finally it is all component, which means you can replace any parts (upgrade or otherwise) yourself, without having to send it off, or spend a fortune on proprietary parts