It looks like they are mostly Ambred showline dogs from what I could tell...I couldnt find a website though.

With the showline dogs I would go to meet the parents and the pups to check out the nerves...also...you want to have a look at the structure.

If you want a more athletic dog I would probably go with a working line breeder...they will usually have some lesser drive pups in their litters along with the higher drive pups.

What exactly are you looking to get the GSD for...what kind of temperment...energy level, etc...

~Cate