You want them to think you need this computer for school, which, of course, you do. What your parents don't know is that there are some great new computer games out now which you are going to want to have. If you are going to try and get a computer for home, you need to think about what you like, what your parents like, and what you believe your parents will support. I haven't met a parent yet who doesn't like good grades. Getting good grades in school is easy with a computer to help you out.
Homework is a breeze.
Not only will you be able to use digital encyclopedias, but with the time saved doing your homework, you can sit in your room and play some of the coolest games with ultimate graphics. Besides, with a set of headphones, you can pop in a real CD and listen to your favorite music while you work away at your math assignment on the computer. It's the best of both worlds. Your grades will go up and you'll be having fun too. If you can get a modem for your computer, that's a real score.