Calculators you regret not buying?

[Johnh]

My recent Hp15C CE is the one I grab several times a day and it scratches an itch I've had for 40 years. Back then, I could never find the money for one and for whatever $ I could afford, a Casio would always offer more than an HP. I programmed my Casios to the hilt to deal with structural engineering calcs , at a time where computers were clunky and scarce in the office. But I didn't love them and I wished they we HP.

These days, I also have an HP35S. I like it and the extra alphanumeric and other features make it better than the 15 for tasks that are a bit more complex, but less than would need a spreadsheet.