TI Calculators

I'm going to buy a calculator. Can /prog/ recommend me anything outstanding in terms of what I can do with it, maybe having any defining features that makes it worth buying like being endorsed by the Sussman?

I'd quite like to program myself some games on there when I get bored in exams. I know at least some of /prog/ will be knowledgable on this subject.

I have read my SICP today. Have you?

HP 50g looks awesome.