In that case, I would recommend shopping elsewhere. One thing most people overlook is the upgradability of the machine they are about to purchase. Technology is moving so fast that by the time you get your new PC home, it's outdated. The need for future upgrades is almost assured. Most but not all the systems being sold through retail stores today are very proprietary.
Proprietary machines are difficult and expensive to repair and upgrade.
Many of them have sound cards, video cards, modems, RAM and other subsystems built right onto their motherboard. Should one of these subsystems go bad or require upgrading, you may have to replace the entire motherboard. One thing you can be sure of is that to get the maximum use and life out of your PC, someday you will want to upgrade it. So be sure to look at this issue closely. While knowing everything there is to know about upgrading is almost impossible for the average consumer, it seems to be the biggest problem in the most economical Computer brands and models.