I have both a TI-85 and a TI-89. Both of these
calculators have served me well in my college classes. I have only this semester been
restricted on my usage of the TI-89. I don't understand why, but one of my professors
refuses to let us use anything newer than a TI-85 or its equivalent.
I also have become dependent on my graph link
that I got from Texas Instruments. I love this little tool that lets me download programs
from the 'net and put them on my calculators from my computer. If you don't have one, I
highly recommend getting one.