This place gives me really bad vibes - aside from the point that they don't list any OFA results for any of their dogs, nor any titles, under their "our dogs" section there appear to be a HUGE amount of dogs and their kennel is licensed by the state. All of this leads me to believe they are a large-scale, commercial operation - and if that's true, it's not someone I would ever want to support or purchase a dog from.
What kind of GSD are you looking for? What lines?
Here is a bunch of info to start with:
Things to look for in a 'Responsible' Breeder