<p>I would purchase a TI-30XIIs and get familiar with it, just so you have something for the classes that won’t allow graphing calculators. There are plenty of classes that’ll allow TI-89’s as well, but you’ll need to be comfortable on a non-graphing calculator. </p>
<p>If you’re wondering if you should step down to a Ti-83 or Ti-84, though, I wouldn’t… at least since you already have the Ti89. In my experience the Ti89 is pretty much allowed any place there’s no rule against graphing calculators.</p>