I will be living alone and I will want to have company when I come home after classes and whatnot.
I fully understand your reasons but look at that statement from the dog's point of view. He/she will be living alone while you are at classes and there is sure to be a social life........... will you really have time for a dog when you are in your last year of studies???

If you want canine company is there a shelter where you can help out when/if you have spare time?