None of the above. College students FAIL more often (as dog owners) and end up surrendering dogs to shelters MORE OFTEN than any other group.
You will not have time, in an 18 hour college schedule load of classes to: buy all the supplies, continually buy dog food, housebreak, crate train obedience train (by attending night time classes) and take it repeatedly to the vet for at least 4 vet visits for basic shots (not counting any other unexpected needs). It will SERIOUSLY CUT INTO ANY DATING, or any library STUDYING...... you plan to do.
You also have NOT explained HOW you will AFFORD THE COST of a reputably BRED puppy ($1200 - $1500) plus puppy supplies & vet costs in addition to college costs.
All of the breeds you have selected are somewhat difficult to train and most are prone to be YAPPY (let's hope your grandfather does not have nearby neighbors who might complain). Yappy breeds can be PROBLEMATIC.... once you move (at some point) into an apartment or condo.
Any puppy will REQUIRE you to come home or for somebody to BE AVAILABLE every 2 (TWO) hours to let it out, so it can go potty, the first month and it will require a LUNCH meal, until 16 weeks old. Is your grandfather physically up to the DEMANDS of a puppy especially if you are NOT available? Does he have a fenced yard?