Hmm...what about a standard poodle? They are very active, are fairly quiet, and great all around dogs, as long as you can keep up with grooming. Greyhounds sound good too. Or perhaps a Samoyed, or Keeshond?

In general, Newfies are great. They are large and enjoy being out and about. St. Bernards are good, but they can be a little high strung and nervous. I have met good and bad Bernese Mt. Dogs, a lot that have problems with strangers. Do you have enough room for dogs that large? Be prepared for drool and hair. Good luck with whatever you choose.