I have a GSD, she's a great one. Just be prepared for shedding, and a ton of it. She's not even long haired and it's terrible, but worth it. So smart, they learn without you even training, they just pick up on it. There is nothing wrong with a pound pup, but I've had 2 pure-bred GSD's in my life and if something works, you don't change it up.
my lord..the 4 cats I have combined do not shed as much as my GSD mix..she's totally worth it though..I just have to sweep more