I Would not buy a Ubuntu computer for the following reasons:
Ubuntu does not work with Microsoft Word. You will not be able to do college work on it, if that is why you are buying it. You will end up going to the computer lab everyday anyway.
Ubuntu does not work with Verizon High Speed Internet. There was a news story about a girl who tried to install Verizon onto her Ubuntu Dell and it did not work! It was a disaster and she got kicked out of college for it because she couldn't complete her online classes. I would sue, if I was here! See: http://www.wkow.com/Global/story.asp?S=9667184&