Top three calculators ?

[carey]

1. HP48G+/GX: Showcases RPL at its best.
2. HP49G+ (3rd gen)/HP50G: I find the 49G+ greenish display background brighter (more reflective) than the grayish 50g display background. 49G+/50g will move to 1st place after I learn those dreaded 50g keyboard shortcuts for commands located on 48GX keys and menus.
3. HP15C CE: Perfect for what it does, and fast.

Two HP calculators I try to like but...
1. HP42S: Easy to program, and while every programming step is easy to follow, there are too many of them so any program beyond a few lines doesn't give a hint at a glance as to what the program does.
2. HP27S: A powerful solver, but I miss matrices.