I will add more support for building your own. I opt to buy a laptop 2 years ago (since I travel a lot, I won't explain the situation), but Desktops are much better when they are built on your own. As for the brands, HP owns Campaq, and they are the same. Dell is decent, customer service is good, but reliabilty isn't supposed to be as good as others, like Toshiba. I broke my F2 button off my laptop a few weeks ago somehow, I never ever use it but some clip broke on and I can't replace it.
Go intel, get 2GB ram, windows (I don't like apple personally) and buy parts from memoryexpress.
If your into downloading, like what I am, pm me.