Suggest a Breed for me?

Sorry, but I'm afraid I am not narrowing it down for you. Quite a lot of breeds fit your description. You are actually describing a working line German Shepherd Dog, a Belgian Malinois, or one of the less common Belgian Shepherd types (Groenendael, Laekenois, Tervuren). A very close approximation would be a Giant Schnauzer or a Doberman Pinscher from a working breeder, a Bouvier des Flandres or a Briard. Hope this helps.