DanJackson, following from what you said about doing a PhD in Toronto, I have no doubt the quality of education is excellent. I do wonder, however, about the academic network. Some people in my country have, perhaps unfoundedly, warned me about this - would a PhD in Canada limit one from an academic network in the US in the form of collaborations, conferences, future jobs, etc? I know Toronto has really solid prestige, so would that (in keeping with the so called 'academic caste system') put it in the same league as top-tier colleges in the US and transcend the geographical boundary? Or would it mostly depend on the networks of advisors? I know fit is ultimately what matters, but I'd appreciate any thoughts on this