Graphing calculator shopping

So as I've been reviewing the various pre-calc subjects so I can be ready for Calc I my first semester, I realized I will need a graphing calculator. It looks like the best options are the Ti-89 and the Ti-nspire. Either one should cover what I need. I tried a few iPhone apps on the Touch. I tried an app called GraphCalc. You can define up to 4 equations and it's relatively simple to use. The graph view can be dynamically scaled by using the 2 finger gestures that work in other iPhone apps. But it doesn't provide the table functions that the TI calculators support and it's not possible to do easy degree to radian conversions and a number of other missing features. I also tried iCalc3D with similar results. So the $0.99 iPhone apps can't take the place of a $160 calculator. I suppose I'll have to bite the bullet and ebay one. If anyone has any suggestions on which model would be better for the aspiring physics student, let me know. I haven't used one in about 17 years.