At the moment, I'm looking to buy a desktop computer due to the fact that the one I have now doesn't cut it anymore. The main things that it will need the power to do will be: Record video using fraps, play Minecraft on high/full settings, and use skype. These three things will sometimes need to be used all at the same time, which my current PC can't do without lag.
I have thought about maybe building my own computer, but I feel like it might be too difficult to build, and I don't wanna risk breaking any of the parts. If however, building it will be a lot cheaper, then I may consider it.