you are completely right, it is hard to rank without knowing a little about what i value. ideally, the perfect program would be include stellar repuation, nice people, great location in a great city, nice facility, good anciliary support ... but that's asking for alot, i honestly don't think there is no such a place.
so, here are some of my thoughts on these program, maybe others can comment too. i esp welcome what all of you think of BIDMC's repuation comparing with the two chicago programs.
BIDMC - great program overall, good facility and ancillary, but i don't love the boston
Sinai/NYU - i like NYC alot, Sinai has better ancillary and facility. interns at NYU seem to get scuted out alot
Northwestern/ U Chicago - NW has a beautiful hospital and a great location in chicago (although i like NYC better), but if i were to move to chicago, got to consider U Chicago has a better rep
Yale - great program, not loving New Haven