It's different for everyone's situation. Some people can handle 10 dogs, some can't even handle one.
If your wife thinks you're crazy, does that mean she's not okay with adding another GSD?
Given that you have a 'dominant' pup already in the house, I would say to wait. At least until he's a bit older (maybe two), before adding another GSD. That's just my take on it though. I know a lot of dogs tend to sort their dominance by age, and if the newcomer pup is younger than your dominant dog, then there should (hopefully) be fewer issues.
Ozzy - Chocolate Pom
-Fastest 2012/2013 U-FLI Pomeranian
"In a perfect world, every dog would have a home and every home would have a dog."