<p>I’m in love with my 84. I used it for AP Stats, and I’m using it for Calc AB right now. It has a terrific stats package (all the tests, lists for statistics, etc). If you get the 2.53 OS it becomes godlike for calculus too. You can do the integrals/derivatives straight on the homescreen instead of fnInt and the like.</p>
<p>Of course, the 89 will calculate indefinite integrals and derivatives, but it’s much more complex than the 84, and its statistics package is less robust. I think that since you’re going to be taking Stats as well as calc, you should get the 84.</p>