A few comments:
All are fine schools – is there one you want to attend above the rest?
I only recommend that a student apply ED if 1) he/she has an absolute top choice and 2) there is no need to compare financial offers among different colleges.
Keep in mind that some schools have ED2 as an option as well (ex. I believe Emory and Northeastern do). I think BC has non-binding EA. This gives you some flexibility.