Well, I know a standard poodle is probably larger than you were looking for but I just had to put in my own personal plug for them. My Bella only barks if Ripley gets her started and, though she does love racing through the yard and playing fetch, she does not demand lots of daily exercise. She is quite happy to just lay around during the day. Of course the downside is the grooming requirement.

I would like to suggest a shelter dog but, even better than that, how about a dog who has been fostered? Then you get the added bonus of knowing in advance how the dog behaves in a home environment (that would help you evaluate the "quiet" factor). Also many are housebroken or the foster mom or dad is working on that. Just a thought.