I agree with jnas, Mortis, and Lemon. Buying a computer is simple, but making one yourself is better (at least, I fell that way

) Not only do you save a lot of money by making your own, you also learn something new. I find the articles from
PC Mechanic and
Motherboards.org very helpful. Of course, there are plenty of other sites online that teach you how to make one. These are just two sites that I have found to be most useful.
Good luck!
BTW, welcome to TechIMO!