I just wish someone would re make the HP programmers calculator. I need the Binary/hex/octal stuff more than anything else and all the calculators today just slap it on as a last minute extra buried in the settings.
That would be the HP-16c. Having misplaced my original (which I used all the time when I was hitting the metal in my assembly programming job), I picked up another one on ebay about 10 years ago. Definitely a good candidate for a re-issue.