The gene for the long coat shows up in some lines. Most reputable breeders do not specifically breed for long coat, it just shows up in litters. There are lots of great breeders out there, but I wouldnt know which direction to point you without knowing more about you and what you want to accomplish with your dog.
thanks for the response. we're looking for a family pet and think the GSD breed characteristics are a good match of what we're looking for, and we really love the look of the long coat variety.