Hmm, okay thanks for all the help guys! Going to have to do some thinking, Alpenhof says they do breed for working drive though?
Sure. Unlike the American showlines, the German showlines need a degree of workability (like a Sch I), to get the top two titles I believe? See the dog rated "V" (I believe that is "excellent") on the website, she has a herding title. The others don't appear to have working titles and so are rated "SG" which I believe is "very good." There are showline dogs that get their Schutzhund III.
Here is one that I like:
YouTube - Schutzhund Courage Test NASS 2007 German Shepherd
But they are called showlines for a reason... they are bred for show, keeping in mind that a GSD should act like a GSD. Working lines are bred for working ability, keeping in mind that a GSD should look like a GSD.
Getting a dog from either line is not a guarantee. Getting one from working lines is stacking the odds in your favor. I don't know who the father will be but none of this breeder's bitches has a Sch title. The sire might. Of her achievers, one is a police dog and one has a Sch I. Is this because not many people try and title her dogs? Because they can't do it? I don't know her dogs but it's something to ponder. There are lots of BH's but that is a stability thing. Second of all, does she have the experience to select the right pup for you? Someone intimate with Sch will have an idea of how their pups will turn out in regards to working ability... I don't know her and don't want to knock her (she might be a Sch expert, but it's just not her thing), but again, something to ponder. So that is my take on the doing Sch with one of those dogs.
Now on the agility side of things. First of all, a GSD is not a grade A dog for agility. But if you're serious about it and insist on a GSD, I would suggest a smaller, lithe female. Look at the structure of breeds that do well in agility. They don't have backs like that, they tend to be small, square dogs. Look at the structure of those Malinois. Look at border collies.
Hell, look at Rin Tin Tin:
No curvey slopey backs there.
As an exercise, search for pictures and videos of show line dogs doing athletic feats. Then do the same for working line dogs.
That is my take on it. If this is the showline style of dog makes you happy, and you simply want to take it as far as it can go in agility or Sch, go for it.