Ludovician and CaptBadAss: Thanks guys. I had about six or seven Model Ms that I ended up selling. I listened to some Model Fs on youtube to hear the difference. But so many have been modified, that there's little aural consistency. I may have to do more research. I see where a GH member, joestran1, has a couple for sale on ebay. Looks like he's put in some time restoring the keyboards.
More pingy--ouch! The ping from many KBs I've owned, IBM/Filco/CMQFR, have been a bit much for me. The good thing about my 87U is zero ping and 55g switches. Testing one would be best. However, in place of testing, I'll look at more youtube overviews.