I have NO faith in my ability to pick a pup.
It's not a pup you want. Ultimately, it's the dog that pup will become that you're looking for. Just about all pups are adorable, including those saddled with health & temperament problems.
By all means get advice & insights from others but do develop a *feel* for what you want & need in your GSD. Clearly know what you're looking for & develop an ability to recognize it when you find it.
When considering a breede,r look at parents, extended family & when possible offspring, especially full sibs if available. Talk to breeders regarding their dogs & breeding program. How long do the dogs live? What temperament is s/he looking for? What health problems has s/he seen, age of onset & frequency of occurence? IF you're interested in competitive sport, conformation showing, IPO etc do the dogs have a history of success in the endeavor(s) you're interested in?
IF you're looking for a pet it's important that the dogs produced succeed as solid, stable, trustworthy pets & family members. Some breeders believe differently but I strongly disagree. This does NOT mean that dogs who excel in law enforcement, IPO &/or herding are NOT suited to be family pets. Not at all. Many of them do, but if there isn't actual proof of this, look elsewhere. Suitable proof, imo, are breeders who live with them in the house &/or have their dogs freely mingling with family, friends, small children etc. I'd also look for dogs that are placed as family companions in addition to work or competitive sports.