Thanks all for the helpful replies. I ended up ordering wheels with DT Swiss 350 hubs with the 18 teeth. I have heard and read that you can keep these reasonably quiet by greasing the pawls instead of just oil. If they annoy me, I may have the rear wheel rebuilt with an Onyx hub. The conclusion seems to be that Onyx is silent, Shimano is nearly so, and the others range from somewhat noisy to very noisy. I would still like to know how the quiet version of the 321 sounds, as well as Alto and Phil Wood. Thanks again