Hello all I have done a lot of searching for what I want in a calculator and have narrowed it down to two choices. HP prime HP 50g All my life I have used ti calculators but really want to use rpn so I am really left with only one manufacture choice. That being said my correct calculators are. Ti 84silver color I love this calculator. The color screen seemed gimmickie but honestly I really enjoy it as well it is really handy for rallying where I often do hours of math in a dark car with nothing but a little head lamp. The problem is that there is no cas and no rpn Ti nspire cas non color I hate this calculator. Do pull it out on occasion when I need cas but overall I have been very disappointed with the purchase some years ago. It takes way to long to boot and above that I can not stand the user interface or keypad. As for my schooling. I have completed all of my math classes and have nothing left except all of the core classes (electrical engineering). To the best of my knowledge both of my suggested models should suit me just fine. My concerns are mostly with the prime. As I have read that the rpn mode is a bit iffy and the software has a lot more bugs. But beyond that I feel like I may hate the user interface in the same way that I hate the interface on the nspire. Can anyone comment on this specific issue? If you were to buy one of these two which would you get and why? Let's leave cost out of the discussion because although it is important I think we can all weigh cost for ourselves.