If you buy from Dell, Compaq, or Gateway your getting it stuck in your a$$. All of the components are proprietary. 99% all components must be from the computer's manufacturer and installed by an authorized computer repair/upgrade center. So if your power supply quits. You need to contact the company, they will direct you to a service center and make you pay 180% for a part and charge labor. If you do it yourself you will void the warranty. But if you built a computer you will end up paying about 70% percent of retail price of the part and no service charge to put it in since your doing the work. Heh you might even learn something while repairing your own "custom" computer. Also the computers look like crap. I would rather have an acrylic window on the side with cold cathode lights that flicker to the music.