It seems nobody likes the 97

[Mike T.]

Personally I'd pick the HP97 . Used one quite a lot (not my own unfortunately) way back and the key layout with the single shift key is so much less cluttered than the HP67, I really liked it. It was a bit of a disappointment to discover that 'real' computers couldn't do decimal arithmetic in machine code (I didn't think 8 bit BCD addition counted)...

Oddly enough my first and possibly only bit of commercial software was a set of 10 digit decimal number routines that could do + - * and / using the 2nd cassette buffer of a Commodore PET.