just spend another 30 on top of the 83 and get the 89titanium from staples. You will never need another calculator again. It does 3d graphing, polar coords, parametric equations. It can differentiate and integrate like an asian on speed, and it also will handle any other calculations you can think of. ++it also comes with EE pro. (Electrical engineer pro which includes a lot of formulas that can be useful in this field and also with the electrical field in general). e.g. it has ohm's law and also AC-DC conversion equations, and the different equations related to A/B amplification.
For 90 bucks you almost wont need the internet anymore imo... except to come to this forum of course
edit: But if you're just looking to get a more basic calculator, just go with the 83. It'll be more useful than the 82 in the long run.