My MLS is from Simmons GSLIS, and I really liked the program. However, I think that it depends a lot on what your focus/specialty will be. Are you hoping to be an academic librarian, a law librarian, school librarian, archivist? Tech librarian?
While I don't think the rankings are "all that," some people do take them seriously. The new ones for 2009 just came out, and Simmons has moved up the list since the last ranking, both in the core LIS category and in archives (and maybe in school lib? not sure about that).
Anyway, I'd weigh your specialty against the $$ and decide-- where do you see yourself? If you want to live/stay in New England, Simmons is the place to go; this might be a bit of hyperbole, but sometimes it seems like half of the librarians in the Northeast went there for their MLS. I can't really speak about the other schools I mentioned, but maybe someone else will pipe up.
