To religionproof-
I am exactly where you are, I haven't been able to buy a plane ticket yet because I just got my funding letter which still has to be sent to me (that I need to still send for the CAQ app)! I was advised by the ISO office at Concordia to obtain the CAQ first, but that it is possible to get a temporary study permit at the border without it (but it depends on who you get in customs). She also informed me to at least print out that I have started the CAQ application process if I do decide to take that risk. I have been very confused about the whole process, hopefully the CAQ doesn't take too long to obtain! Good luck with everything.