I do not personally have a German Shepherd, but we had several while I was growing up. So I've been around the breed for years.
They are very smart loving dogs. My sister had four at one time. They all, but one, lived to be around 15 years old. They are prone to hip dysplasia, but with proper care can still lead a long happy life.
Be prepared for stereotypes. Many people look at GSD's as "aggresive" simply because they are a common breed used by police.
As for the name, that's entirely up to your brother. Both Max and Jasper are good names. I like Max better, but probably only because I've had a cat named Jasper.

I hope we get to see pictures of Max/Jasper soon.