My decision has been made, after a weekend of drinking and deciding (not simultaneously, don't worry). I'll be moving to Guelph to start my PhD in January; I've already lined up a TA appointment (Ethnobotany Distance Ed). Now that the big decision is done, I have a zillion little ones - basically, everything I own gets the "do I really want this?" treatment, and I have to give notice to my landlord, contact a bunch of people in Guelph, including potential future landlords, learn a bunch about shipping (some of) my possessions, dispose of the Minivan of Doomed Love (fireball?), and tons of other stuff I have in a list.
Oh well, now the biggest uncertainty is out of the way, and I get to deal with all the little uncertainties. Joy. I'm really looking forward to March, by which time I should have 99% of my current uncertainties settled, with all new questions to deal with.