Have you looked into the Das Keyboard? It's a mechanical keyboard built the same way as the old IBM Model M.With my good old 20 years old keyboard I can reach > 100 with ease.
Awesome hardware btw. no computer hardware of this quality is manufactured today - built in 1992, hand-signed by 2 different QA guys, these are built to last forever (or at least, for a very long time).
Years ago, I got 2 of them in a 2nd hand hardware store for a very low price - that dude probably didn't know what he was selling there and how expensive these keyboards originally were - and no, I didn't tell him
On my notebook, I struggle to get a score of 60, so yes, keyboard quality matters a lot.
You can get a standalone ThinkPad USB keyboard. I've always found them pretty quiet myself.
I know both daskeyboard and the Unicomp products. Both are excellent but neither of them gives you this extremely solid feeling of an original IBM Model M. I doubt such a keyboard will last for 20 years, but we don't really knowHave you looked into the Das Keyboard? It's a mechanical keyboard built the same way as the old IBM Model M.