I agree, it depends on what sort of course your doing, how well you want to do, how much time you will be devoting to studying etc. Though summer holidays are quite long for us uni students which would be a great time to get a puppy, plenty of time for toilet training, socialisation, training in general and bonding with each other. I would probably wait until you have been at uni for a year so that you know roughly how much time you have for a dog etc as some breeds need more work (training, exercise, grooming etc). You will also have to keep in mind that as you go through uni the course load will get heavier so that you will have less time for the dog.
you would need to be looking at breeds that are ok with being alone for long periods and that don't need much stimulation as uni tires me out (not sure about you though haha) a lot of it depends on yourself and your circumstances. also if your intending on renting you would need to find one that allows dogs. wow the list goes on.
I would wait until you have settled into the house and into uni life so that your not stressing about all of it at the same time. And I would strongly advise getting the pup during the holidays so that you can set good groundwork before going back to uni .... hmm its late/early and I'm rambling. I'm sure I've missed something. I will revisit in the morning...
"In order to really enjoy a dog, one doesn't merely try to train him to be semihuman. The point of it is to open oneself to the possibility of becoming partly a dog." - Edward Hoagland