Update on the calculators: I have an HP 48SX and an HP 49G. I love 'em, though of the two the 48 is probably more logical and better made.
I've never used Forth, but will check into it.
On computer languages, I prefer Awk, Python, and C. Awk is great for streamed data. Often I deal with files in the millions of lines, often text mixed with numbers. Awk is great for that! Python's modules are bloody outstanding, and the data structures are as important in programming as any commands. Unfortunately Python is so bloody f*ing slow, hence C. While a bit more onerous to program, C programs just run so fast. Finally, I prefer Linux as a computing environment. It allows my ideas to flow without interruption. And that too is why I like HP calculators. They allow my ideas to flow.