If you just want the basics of a computer, where you have your internet and itunes and all your word processing (word,etc) programs then you could survive very well with a deal that HP has.. For about 600 dollars, you can get a laptop with a CD-Rom/Cd-Burner, 60-gig harddrive, and 512 MB of ram.
HP Notebooks
That page there displays a few laptops that you can choose from, and i think even choose the few things you want. Every computer no matter its use will come with Microsoft Office or Microsoft Works. pretty much the samething except the file extensions, which are very easy to change.
Hope that helps you out..