I've come to greatly like the ⅛" slab of Al Apple USB keyboards (the full size one with numeric pad). The laptop style short travel keys make switching between laptop and desktop easier in terms of muscle memory, but they still have a nice positive feel to them. The Al slab gives a good weight to it, stopping it moving about or bouncing.
Prior to that, probably Sun type 5/6/7. Old IBM keyboards were generally somewhere between legendary and excellent, with the side benefit of being capable of bludgeoning intruders. Old HP keyboards mostly good.
A mandatory feature for me is that it must always have a non-linear resistance, resulting in a positive tactile feedback so that my fingers actively sense that the electrical connection has been made. I believe that is also beneficial in terms of reducing RSI, as you can (by instinct / reflex) moderate the muscle pressure so that you are not pushing hard against the limit of travel, once you are used to the particular model of keyboard. The peak physical pressure is somewhere in the middle of the travel of the key, with a positive drop in resistance just after (or simultaneous to) electrical contact.
As for what I am, veteran coder/sysadmin/engineer, occasional contributor, with Unix experience back to relatively early days (8086 era, IBM PC-RT 6150, Sun 3 / SunOS 4, etc). I remember K&R C being the standard, and ANSI C being the new thing.