I do not recommend Nadelhaus.
I don't know anything about the other two.
California German Shepherds Breeder with Puppies and Dog For Sale| Perfect German Shepherds
I don't see anything there about pedigrees or OFA testing, just a bunch of pictures of their dogs. They don't seem to do anything with them either, it looks like they're just breeding pets to make more pets. Not someone I'd have any interest in buying from.
German Shepherds Breeders California German Shepherd Puppies forSale Los Angeles: Wustenberger-Land CA
I've at least heard of them, they're West German showline. There are pedigrees showing for their dogs, and they have IPO titles and OFA ratings listed too. No personal knowledge of them, but I'm not seeing any red flags either.