Highly recommend Jurgen at von Datschiburg.
He competes at high levels of the sport (I believe he was just at Nationals last week or so) and is a dictionary when it comes to the breed and sport. VERY knowledgeable.
I have a friend who purchased a pup from him a few months ago (pup is about 5 months now?) and is very happy. He too is training in schutzhund, but the dog is also a great family companion.
I have met and watched many of his dogs work over the last few years and can say without hesitation that he is an excellent man, breeder and trainer.
His wife is just as great and together they do some amazing things with their dogs/breedings.
Here are a few others that our club recommends:
Breeders - K-W German Shepherd Club