Well several years ago I was using the 48GX and I loved it. At that time the big TI calc was the 85 (actually the 92, but it was new and our school didn't allow them) which was OK but I preferred the HP over the TI then.

Well at my college the only calc that is allowed (and required) is the TI-89. And to be honest this calculator is pretty nice. Granted I do miss the RPN notation and stack on the 48 but the 89 does everything the 48 did (maybe +/- 1 or 2 things one does over the other).

If you do go with the TI-89, I would definitely get the Platinum just because of that extra memory.