A short message today as I am traveling; but I saw an article that celebrated that the computer keyboards provided by IBM in the 1980's and early 1990's were the best ever built. They were solid, heavy (meaning that they didn't move around on one's desk). And they "clicked" both in sound and feel. That click gave the typist tactile feedback when the key was depressed that yes, you had actually typed the character into the system. And I have read in the past that there were ergonomic benefits to the tactile click too.
I preferred the second generation IBM/AT keyboard with the large return key and the function keys on the left side arranged in two columns. The original IBM/PC keyboard of course had the function keys on the top row as we see on most systems today.
The article points to "Clickykeyboards.com" as a source for finding both the original keyboards and PS/2 to USB adapters.
And other comments noted that Unicom at: http://www.pckeyboard.com/ was another source for a new / similar keyboard.
Happy typing to everyone.