I sifted through all the comments and suggestions I chose the Frankfort Arsenal unit. $49.99 w/free shipping. It showed up today. 5 minute "assembly/setup." The bowl assembly is separated from the motor by pretty stout springs. The cleaning media won't be here until Wednesday. Regardless, I powered it up for a few moments. Best description I can think of is a low, very quiet hum. Light years better than the old RCBS I had many years ago. Clearly this will operate on the garage floor sitting on an old bath rug, and we'll never notice it inside the house. If it cleans well, I will have achieved three goals: functional, inexpensive, quiet.
Thanks for all the responses!
-jb