Does this seem like a reputable German Shepherd Dog breeder?

I agree with Chix about the dogs' backs on the website. Show quality GSDs often have hip, knee, back, etc problems because part of the breed standard consists of a weird hip silhouette compared to what is normal for a dog. Do consider adopting from a shelter because there are tons of German Shepherds that need homes.. the are one of the most popular dogs to end up in shelters along with labs, Goldens, Australian Shepherds, etc. Petfinder.com is a great resource for finding homeless dogs near you and you can search by breed, etc. Not only will adopting be much cheaper than purchasing from a breeder, but you will be saving a life and have an eternally grateful partner thanks to that choice. Unless you intend to show your dog, I would really recommend adopting from either a shelter or one of the countless GSD rescues out there.