How would you feel that Dal ranks??
Dal is, arguably, an inferior place to study law, but it has a much better reputation in the canyons of Bay Street. Additionally, Halifax is a much better city than Fredericton. Law school is hard enough without having to be blue about the place in which you live.
Still, though, there are far more prestigious law schools out there, and believe you me, the perceived prestige of your law school counts for a lot when you try to find articling jobs (which jobs, incidentially, determine whether you will have access to the top jobs later on in your career). Think long and hard about it, and really give it your all to get into the very best law school that you can. For true flexibility, I think that you would do well to consider the joint LL.B.-J.D. programme offered by Osgoode Hall and N.Y.U. (Osgoode, like Dal, is frequently accused of coasting on a reputation for excellence built many years ago, a reputation that some might argue it no longer deserves, but mention its name to many in the legal community, and their eyes light up. It's hard to argue with that kind of reaction.)
Having the option to work anywhere in the States (your LL.B. will not get you anywhere in the States, no matter what some might try to convince you) is of crucial importance should things not work out for you in Canada and the United States is not a universally bad place in which to live and work (whatever the CBC might try to tell you).