[EricH]

My other two calculators:

(I forget the name)solar powered four-function: old, very old.
Tip: Use very strong light. It does not have a battery.

My second (current backup) calculator: scientific.
Tip: don't try to do long equations; it will take you forever to go from end to end.

Oh, and my TI-84 has a USB cable so I can get screen shots onto the computer or get other goodies from the company, and it wasn't much more expensive than a TI-83.