You sure these ibooks are gonna work out well for what your high school son needs? If he/she needs a laptop that connects to the internet for home work,you really would be better off finding a used macbook! Yes a ibook can surf the web,but if you come up against a flash heavy site or one that used video you will soon find the limitations of the ibook.
If you use the basic geekbench scoring system your 1.2GHz ibook gets a score of about 630,where as a 2007 2.0GHz macbook will score about 2600.
You should be able to find a used 2007 macbook for $150-200...you sure spending the money on the ibooks,ram,office ect is really worth it?
You bring up a valid point Tom and I'm sure we'll see these limitation soon enough. I've spent just under $250 for the laptops, memory, and software. At the very worst, I've inherited some tinkering time on my part. But for the cost, I think it'll get us acclimated to MAC before I buy my son another laptop.