[ghaff]

I always preferred the RPN HPs. I used an HP-55 through most of college. (I started with an early TI scientific calculator; I began university just as calculator prices were really dropping and discontinued HP models only became relatively affordable a little later.) Then I had a variety of other HPs over the years including an HP-41CV with a Financial Pac.

Unfortunately, the modern "HP" calculators are not as well made or have as good a keyboard feel.

(I actually didn't have a calculator until college.)