If I were you.. Id just go to the shelters near you and look at the dogs they have instead of deciding on a specific breed before you go. You never know what kind of mixed breeds they'll have..

And even if you've seen one or two dogs of a certain breed.. that doesn't speak for the whole breed. Breeds get their reputations from how the majority of them act, and there are always exceptions.

And like a previous reply says.. you'll need to train your dog to your liking, regardless of the breed.