Re: KeyTronic
Yes. This.
I have a KeyTronic Classic keyboard at home which I bought in 1997 and have used pretty consistently since. Surprisingly, for a keyboard from that end of the '90s, it has an AT connector so I have a daisy-chain of adaptors doing AT->PS/2->USB. I first used one at work on my pre-uni year in industry and knew immediately that I'd discovered my keyboard nirvana and had to get one of my own. Unlike every modern keyboard I've used, the legend is still perfectly readable.
I've tried to get hold of them since but UK layout seems to be unobtainable (and I don't know whether the ones made today are the same, anyway). I have a couple of older ones which I bought for about 50p each at the fabled Forum Store at Southampton University (I used to get the train down from London to visit) but they lack the Windows keys, which are quite useful even on Linux (I always assign Right-Win to be Compose).
Some years back, looking for an acceptable modern substitute, I bought an expensive mechanical keyboard for my other PC with Cherry MX Brown switches (tactile and silent; I wanted MX Clear for the even heavier actuation force but could only find Japanese layout keyboards with those and I don't recall MX Grey being a thing at the time) and, while it was an improvement on the cheap squishy thing I'd been using, it is a pale imitation of the KeyTronic.
At work, I'm currently using a Dell KB-1421 which I found in a box of random keyboards. It's actually quite nice. It's rigid and conspicuously heavy (nowhere near as heavy as a Model M, of course), unlike the usual Dell branded plastic-o-rama fare that comes with their PCs. It has a lot of tactile feedback, good key travel and fairly high activation force. It is beginning to lose its legend, though, which causes problems when other people need to use it.
As you can tell, I'm not really a keyboard connoisseur - I just know what I like and what I don't like. I like long key travel, heavy action and tactile feedback. A steep and curved rake like my KeyTronic is good. I don't like clicky keys. I abhor chiclet keyboards (I just can't seem to type fast on them). I also dislike backlit keys - I find them distracting. As for RGB, my views on it are unrepeatable in polite company (or even on the Reg forums!)