I can't recommend any breeders, but I know if you will share any details on your plans for the gsd, others on here will be able to help out better. Plans such as IPO, SAR, etc. or if you're just looking for a level headed dog that will just be a loving family member. The more they know about what you want, the more specific they can be with breeders.
ETA: Sables are the best. Good choice.
Apsel der Schwarzbar -- Dark Sable -- 10/31/2013