Mechanical Keyboards

For sound, apart from clicky, keyboard and keycaps will have more of an effect on sound, particularly if, like most people, you bottom out while typing. The operational bits of both tactile and linear switches are not inherently all that noisy, though over time people can definitely hear a difference. For "thock," thick PBT keycaps and a board with lots of foam should be a decent start. The terms are notoriously variable though, and Hipyo, fun as he is, is not trying to wow anybody with acoustic science. Stuff the case with, well, stuff (or, these days, buy a board where the factory already has), and you'll get a fairly flat, deep sound profile that is not unpleasant.

Or so I am told, LOL. WTF do I know? I love big dumb loud clickies, the heavier the better.