Which Calculator, recommendations?

I'd go the whole hog and get a TI-89. They're great machines, and you'll never really need to buy another one, so the extra $20 or whatever it is is negligible given the years of use you'll get out of it. I had a TI-89 when I was in high school and it swerved me very well :) Failing that, get the TI-84. �55 is quite a good deal.