Best way (IMHO) is to go to a dog show and find the shepherd ring. Talk to the people there about what you want and they can point you to a good, reputable breeder. You want someone who is breeding for health first, then intelligence the rest comes with the package.
No matter what breed you are looking for, find those who love the breed first and they'll help you find your dog.
Thanks for the info, this will help in my search. I won’t buy until I find the right breeder, that’s for sure.