I had no idea where to post this. Anyways, I want to buy a graphing calculator. I am deciding between a Ti-89 Titanium and a Ti-Nspire CX. Or, is there another calculator you suggest? Right now I have a Ti-30XS, and I like the kind of logic used to enter my math into that. I don't like the reverse logic or whatever the other type is, that I believe CaSiO uses. Any help?