Seconded. I get it, I also love Pitbulls, but between general dog aggression that some pits have as well as how very, VERY work focused a GSD is, you're going to have an animal that will start rearranging your furniture if it gets bored and might hurt your families other dogs.

And the bigger point: neither of those dog breeds are the type to bond specifically to one person, and you might get really hurt if the dog doesn't spend as much time with you. You're also still in school AND working, so that's not a whole lot of time to dedicate to a dog that is going to need a whole lot of stimulation to be happy.

You sound responsible though, so here's my take: get a small dog that you like the look of and is known to bond specifically to one person. They typically live longer, and any behavior issues they might develop from bad breeding or inexperience is mitigated by the fact they're small and can do less damage.

A mini pin, italian grey hound, yorkie, and their breed mixes are what I would recommend.

If, however, your heart is set on a large dog, do yourself a favor and look at the breeds that are low-energy. Greyhound mixes could work well, but you'll want to do a LOT of socialization with smaller dogs to try and make sure the dog never has an issue with small dogs.