Oh dear, I'm very far down this particular rabbit hole.
Currently I'm typing on a Focus SK-5001, with white Alps SKCM switches. It's big (battlecruiser-ish layout with extra F-keys on the left, 8 arrow keys and a fully functional calculator built into the num pad, although for me it only works when the PC is turned off... It was NOS and I'm happy to report I've at last found an Alps-based board that I actually like to use.
It also has LEDs in the lock switches, which I really, really like:
I have SGI Granite, Dell Bigfoot and Apple Extended Keyboard II and a NOS OEM version of the Focus FK-2001, but all have bad key binding problems (lots of friction when typing, only feeling decent when pressed perfectly centrally). The used ones probably have dirty switches, a common and very fiddly to fix Alps problem, but the FK-2001 was a disappointment. I was happy to type on a NOS Matias Tactile Pro 3 with Matias Alps-derived switches, which typed gloriously but due to the hollow polycarbonate housing was the single loudest keyboard I have ever used. I like clicks, but this was deafening and unusable for work, even work from home due to it drowning out everything else 😜
Then there's IBM. I learnt to type on a Model M Enhanced Keyboard on my parents' PS/2 in the late 1980s. Still have a gen 2 Model M, also some gen 3 and at work I have the silent touch version, which is a (surprisingly good) rubber dome board inside a Model M housing. I also have the F 122 'battleship', which I consider the finest engineered keyboard I own. I also have a modern 88-key TKL board with F switches/keycaps. It's good, but not as great as the old one and I miss my numpad. Finally I have an M2 which of course has dead caps. I want to fix it because despite it being considered cheaper and worse than regular M, I like the feel of the keys.
Inevitably I have a pile of Cherry-based boards, some pretty generic blue and brown based ones, then a huge Deko Fast Action board with Cherry Blacks and a nice little display. This is my main board at work, if mainly for show, as I prefer tactile to linear switches. For all that extra stuff it needed a separate power supply, which I hacked off USB:
I also have some more modern ones; for years a Leopold with Cherry Browns was my daily driver until the (ABS) keycaps literally started eroding. I have some really cheap AliExpress boards, some of which are actually quite decent (particularly after fitting custom switches - another rabbit hole 😉 ); my sons mainly use those. I have a Ducky Shine kit very similar to that Filco board of yours I intend to complete with Outemu Forest Silent switches one day when I have time.
Aside from the big three, I have various oddities, like a Fujitsu board with its M-like but utterly awful switches, some BTC foam & foil monstrosities, the keyboard from an Osborn One that I wrote my own (not particularly good) controller for as an exercise in Arduino programming. Oh, and a Creative keyboard with a tiny (and crap) musical keyboard attached.
Rabbit hole indeed 😉