Thank you so much for your input everyone, much appreciated. I'm doing my homework because person/dog fit is so important, and doesn't happen as often as it should out there.
When I say "calm" my background is larger dogs, having had two labrador mixes in the past. One was a Lab/Husky mix, the other perhaps German Shepherd and Labrador. I found both of them perfect in terms of energy levels. The lab/husky mix would bounce through the fields like a deer, have fun and come along on hikes, etc (with of course daily walks). But if he didn't get that level of exercise that day he would be happy to chill with us, or on his own. I liked that he was both social and independent.
I have limited experience with smaller dogs but have found them sometimes to be a bit more *wired*, like they've had too much caffeine ;-) Someone on this forum used the "yappy and snappy" description, and I would want to avoid that at all costs. I think breeding and rearing has a much to do with this, as well, so I'd like to know more about mpoos.
My ideal dog would be intelligent, goofy, non-shedding (!), take 1 mile walks with me, do obedience training, and want to relax too without needing my attention every moment of the day, or otherwise bounce off the walls if he missed that perfect stimulation. Perhaps that is just a balanced dog?