Have you done this test?
PEDIGREE: Select-a-dog

It might help you narrow down which breed to get.

I think all those breeds you mentioned need quite a lot of exercise, are you going to be able to give them the exercise they need? I only ask because I remember you posting a while ago about how hard it can be to get Shell to go for a walk. I don't want to put a downer on your plans - sorry if I've stepped over the line.