I use a reproduction F77 with a solid (thick) zinc chassis at work. The boards literally weigh 8 pounds. I have an original F107 I'm playing with at home that weighs 10 pounds. I'm confident I could use them as body armor in a war zone and whip them back out to type on. I'll still use whatever random production board of reasonable quality myself. The Das Pro/Ult 4 is very well built, Corsair's K60s and K70s, TG3's old BL82s and "cop keyboards". Even Cherry has a beefy aluminum keyboard in the MX 6.0. I hear good things about IKBC as well.
Kailh's thick clicks (jade and navy) in particular, are wonderful. I can say, fairly objectively, that they're possibly the finest clicky switch that hasn't been out of production since the early 90s (or earlier). The jades come close to SKCM blue Alps and IBM's capacitive buckling springs, if you ask me. They're satisfyingly crisp and consistent while being pleasantly bassy to boot. Some people do not like the contrast between the stiff clickbar and relatively light return spring on the jades, so they may go for pale blues, etc. Navies are perfectly balanced in this regard, and a wonderful feel and sound all their own (though higher pitched) but they're also pretty stiff, and can take some getting used to to type comfortably with. For regular MX clones, both Outemu and Gateron blues are more smooth, crisp, and less rattly than MX. Gateron blues even seem to me to have no rattle at all. Quite nice.
I'm not a tactile guy, so I can't form an opinion of those other than that MX browns are the worst switch I have ever felt (very gritty, no perceptible tactility as a result), and outside of the horror stories I have read/heard of dead switch types, you can only go up from there. Some people have a very passionate love for MX brown though, so what do I know? People mostly prefer expensive boutique switches for tactiles and linears. The best I have felt are Everglides, the best I have felt of the common production tactiles are Gaterons (as far as smoothness goes) with a slight edge over Kailh's box tactiles, which have more tactility than you're going to get out of any pure (commercial) MX clones that I'm aware of. MX clears are surprisingly smooth and satisfying, for a Cherry switch.
All opinion, of course. Might help with narrowing things down.
