Cool, congratulations !

I am afraid I can't be of much help, tbh, because I don't know much about any of those Unis. However, may I suggest that, if it's feasible, you contact (through email), some of the students who work in the same department you're gonna be part of, and ask them a few questions ?
I'm thinking, sit down and come up with a list of questions that you'd be interested to know the answer to, and that would be a factor in your decision. For instance, I don't know exactly what would be important to you, but here's some hints: how expensive is life there (including finding accomodation - rents may vary hugely from big cities to small university towns) ?
what are their complaints, or good things, about their department ? (You _know_ which department you'll be in, so you can find the right people to ask about this). What can they tell you about the facilities in general, other than what you can find on the web yourself ? etc.

And you can just come up with something like this, and email it to a couple of students in each Uni.
It's just a suggestion, of course - I'm a lazy bastard myself, and I don't know if _I_ would go to all that trouble :)

good luck !