[DarthShrine]

I have an HP 35s which I found to be a lovely calculator which got me started with RPN. Unfortunately, I wasn't able to use it at school for my final exams since they had a list of specifically approved calculators (which the 35s would never have made since it's programmable). I switched to the Casio fx-82AU Plus which graphically displays your calculation, meaning you don't have to keep track of the inside-to-out expansion of RPN or the mountains of parentheses you usually require in algebraic mode. They're both good systems, but I can see the graphical display being more useable for most people (despite being awfully slow).