Top three calculators ?

[HP67]

HP-12C (gotta pay bills)
HP-48G/GX (favorite model of all time in terms of usability, but I said in another thread and I agree with @edryer that the S/SX is the most beautiful of 'em all but has the worst screen)
DM-16L (I write assembler for a living. And I'm kicking myself for decades now for not buying a 16C when they were still in production. I bought a TI-Programmer back then instead that self-destructed after a few years like all the TIs I have owned)
1st runner up- My HP-67 is in storage. It's a brick, it's wonderful, it's the pinnacle of calculator art. But RPL is so much better for writing programs than keystroke programmables.