Welcome to the forum. I like you already. I totally agree with Mary Beth that you will learn a lot reading through the threads.
My husband also wanted a gsd because of superficial reasons
But unlike you, we didn't think about whether or not the breed would be a good fit. So kudos to you
I think your attitude and active lifestyle will be a good fit for a gsd. Speaking just from my personal experience, Mac was easy to train in that he picked up on everything very quickly...pottie trained in a week, learned commands immediately, etc. but that same intelligence has made him very challenging for us. Thats my 2 cents.