Wow, maybe that major change was unnecessary?
Colleges no longer use HP calculators. Most use TI's now. The TI-89 is the most common. I have the older (and cheaper on ebay) TI-92. Its huge!
Ti-92 (wow prices drop during the semester! I bought mine for more than twice that in august!) its amazing what it can do once you learn its buttons (before that its hard to make the stupid thing add 1 plus 1)