I agree with the above posters. There isn't much difference in the quality of education you will get with ANY of the Canadian schools. If you aren't sure where you want to practice (Canada or the US) you should attend school in Canada. The process to take the bar in Canada with a U.S. JD can be tedious. You may have to take additional courses, sit for more tests and you'll still have to article once you transfer back. You're much better off staying here.
Good luck with your decision.
I was on a forum for LLM's (not the one on LSD) and one U.S lawyer was telling us about his experience getting authorized to practice lawin Canada. He said he had to take additional courses, take a certain amount of tests (for him it was 6 AND they were $500 dollars a pop) and he still had to article for a bit.
To the most recent poster, when we mention "any" Canadian law school is better than a tier 3/4, we're referring to the fact that, outside of the regional market from which the school is located, the degree will still be seen as better. I can pretty much guarantee you that a degree from Manitoba will have a better chance in the Ontario market than say a degree from William Mitchell will have a chance in the California or New York market. Obviously though there is more opportunity in the Twin Cities than Manitoba.
Oh and signing your name in a forum ftl.