Hi my name is prof. Bills, and I spent 10 years studying how to utilize calculators to their fullest potential. I have owned and studied them all. My calculator lot consist of 3,000 calculators. After school I have taught classes on how to cheat and utilize calculators to their full potential. I tell everyone that If you teacher gives you a tool, then use it! Fight back!! Win!!!
If you have any questions I will do my best to answer them.
The calculators that I recommend the most are the:
scientific: Casio Super FX Plus
Advanced: HP prime
HP G8X92AA LA Prime v2 Graphing Calculator