OTerryA

The TI-89 Titanium is still a "best in its class" and probably the most capable calculator you will be able to bring in to SATs or in many cases for tests also. It is a bit cumberson to use and the user manual is the epitome of user manuals everywhere (it sucks big time) but its capabilities are great. If you want to improve on any in the library of the many built-in functions, you can write your own.