If your going on a mass killing spree ,(internet) you have to be prepared . I was watching my nephew throw together these machines . Him and my 2 sons ordered all the parts on the web and built these beast . Cost about $1100 with 22" flatscreen .. If you could buy these at say best buy it would be about 3k but they don't have machines like this . They got all the parts here..
http://www.newegg.com/ under "computer hardware" ,, Pic your own mother board ,, fans ,, hard drive ,, power supply ,,other stuff .. Sure John R is all over this .. My nephew was some kind of tech support in cambridge.. Guess most that work is done in India now . He's out of work now ..