Top three calculators ?

[edryer]

OK four...

HP-50G
Much maligned but great build in my opinion and as a platform for College Maths it is unparalleled. Every single function I need is available and many I haven't even heard of that I expect have extremely limited use but are still are there. It is an absolute powerhouse.

HP-28S
Best Keyboard ever. Absolutely beautiful machine. Pity about the weak battery door, but there seem many still available with good doors (expect they have been especially well treated ones though where the owner was well aware of the issue and did everything to be super delicate).

HP-48SX
Most beautiful design, layout and colours. Physical logo (unlike other 48's) - BUT... that screen... one day I will work on a transplant from a Black screen model and have the perfect machine.

Voyagers
Surely in everyone's top four.

I would like to say HP-42S but never owned one!