Excellent article on this exact matter that I found yesterday:
http://graphics.tomshardware.com/gra...302/index.html
If you do no gaming or hard core graphics put yourself in the "Internet and Office User" catagory.
If you do some graphics such as photoshop/watching dvds/general graphic design put yourself in the "mainstream pc gamers".
and so on and so forth...
You should be able to pick one from there, if not, you'll come out with a better understanding of what you need.