Not much a technical insight here... I just found it intriguing that from the time I first posted to the forum about mechanical switches and keyboard layout it took me two weeks to get my hands on five different boards! ;-) The main board I use at work now is a Filco Tenkeyless MX brown, my first mechanical and the only one purchased new; love it, but miss the numpad, and wish the right-hand side windows key wasn't there... through my search for a model F, I came across two other IBM boards at local computer repair shops, a 1989 model M (1391401) and a 1997 model M13. A lot of time spent cleaning and restoring the former, and it's now beautiful and shiny, albeit not being used regularly. The M13 is waiting for a replacement key, and some thorough cleaning. My AT model F was found on ebay, I really want to be using it but it too needs some thorough cleaning, and the spacebar badly needs to be relieved. Finally, I found this black Kinesis Advantage buried in the office, which, too, needs to be thoroughly restored.
My boards ranked by usability: Filco tenkeyless; model F; IBM model M/M13; Kinesis.
Ranked by classiness: model M; model F; model M13; Filco; Kinesis. This may change as I get to restore the ones I hadn't had time to attend to.
Just a quick thought Re: tenkeyless vs navkeyless: I really love the way the model F is organized in terms of the layout of the different sections. It feels great on the desk, and when I hold it on my lap as well. I do wish the layout of the particular sections more closely resembled the accepted standard though---I'm sure I can adapt, but for me everything feels a lot more intuitive when typing (say) on the Filco. It is my hope that a model F inspired board will be manufactured at some point in the future---I'd love to have one! ;-)
Thanks everyone for your welcoming spirit and wealth of knowledge! It's been a great journey.
EDIT 1: neglected to mention a Goldtouch GTC-0077 numpad (MX browns) that'll be arriving soon...
EDIT 2: also an interesting cost distribution, where two of my boards cost >$110 each while the others were <$5 each ($10 if you consider replacement parts) ;-)
G