This breed is, as a general rule, a LOT of work, training, time and maintenance. There is thread after thread on this forum, as martemchik said, about overwhelmed new families or people living in other's homes, etc... and it rarely works out for the dog. First-time owners can do well with this breed, but that's generally with a lot of time and dedication. These really aren't dogs you get "just to get a family dog," unless someone in the family is super dedicated and the whole family is on board in general.
If you still decide to go this route, I would look into getting an older dog. A high-energy, high maintenance GSD pup/adolescent plus a new baby is a recipe for disaster (read the threads of very overwhelmed people who have dogs that are wreaking havoc because there is no structure or training, because there is no time). You can find lower-maintenance GSD's, but that's generally easier to do with older dogs- what you see is what you get.
I agree with what Dawn said- get out and see all of these breeds. There are so many stories of people loving the "mystique" of the GSD, but not at all being prepared for what they can actually be like. This way, you can talk to owners, see the personalities of the dogs, etc, and see what you'd like in a dog.