Adult lab or retriever... they are generally good natured, playful, and low maintenance.do you have an idea of what would be a good breed? laid back, smart enough to house break fairly easy? Med. sized
Adult hound might be good, but I have less experience with those. Redbone coon hound would be my choice.
What about another Cocker? Or any spaniel.
Puppy training for you guys would be a huge amount of work, and I think the burden would fall on you too much.