What would your ideal HP calc look like now?

[Frozen North]

An important part of the calculator experience is the user input interface. Those sturdy, double-molded, sculpted hinged keys with clear tactile feedback as seen in the HP-67 and its brethren surpass all alternatives, then and today. Having to use cheap, mushy keys is not for me. Likewise, using an emulator on a phone or tablet with no keys at all can be just as bad. I don't want to have to look at a keypad while usng it, just like I don't want to have to look at a keyboard. And I don't want to key an eye on the display to make sure that a press registered properly.