I have two Model Ms. A standard, and a black M13 (the one with Trackpoint). I've never had a problem with noise any place I worked; I've found longtime cubicle-dwellers have excellent tune-out ...
I have a keyboard from the late 1980's or very early 90's that I'd like to use with my Mini. It was brand new-never opened and looks like an IBM Model M. It has the huge connector, not the purple or ...