If you like large fluffy dogs bearded collies are quite nice. There is one I know that does agility and seems a really nice dog to live with. Lots of grooming though and one would need to find a good breeder. I have working bred dogs now as I run sheep, but I did have a showbred BC and she was smart, chilled, loved a walk and was a very social and sweet dog, not particularly high drive but highly trainable. All my working dogs are used to be left penned for periods of time but they get plenty of attention and stimulation when I am home so it doesn't seem to bother them. In suburbia my cattle dogs were also well used to it and they had a dog door to get into the house.