What dog breed sounds best for me?

No matter what you should walk your dog once a day even if it is a lazy breed. Funny enough I think that a rottweiler (one of the breeds you actually like) may be a good choice. I had one for years and she way very calm and was a fantastic dog. The problem with Rottweilers is that you may want one that is still a puppy (between 6-8 months) because they can get bad habits and can be aggressive if you do not establish dominance and teach them that biting is not acceptable. They are incredibly stubborn dogs but are definitely worth all the training and work in the end.