While no substitute for trying a few yourself (if you know people that have some of the keyboards you are considering). FWIW, I would suggest either a Northgate/CVT Avant or IBM Model M/Unicomp keyboard. I prefer louder, clickier switches, though. Oversimplified, the Alps (Northgate/CVT/Matias) are higher pitched, if not louder; and the Buckling Springs (IBM/Unicomp) feel more tactile. If you don't like quite as much noise, you may want to go with a keyboard with Cherry's "Brown" switches like the Filco 'boards. I have never used them myself, but they are supposed to be much quieter, but retain some tactility. I have never used a HHKB, so I am not sure about their feel/sound.