Good afternoon!
Very difficult to discover which calculator will become your 'partner'. I had begin with casio, a very old model (that i can't remember the number.. fx something
I loved that calculator till discover HP. My first was an HP 48Gx. RPN was a problem in the beginning but, after practicing for a long time makes more sense using RPN than the style FX used.
Now, Casio has a lot of calculators with 2 lines display, to show you the equation. It's easier to who doesn't know math very good, because calculator does the work. But I still use RPN.. with another HP model... but with the same old and good idea
My advice is: try to use RPN in a calculator... and see 'the power' of that kind of calculation
Or, choose the calculator you think will be your best partner... and, believe... it will become