I am in the same boat with you, that is why I applied for the part time evening division. I have not heard from the other schools yet, but I applied to Fordham. Brooklyn is a great school and I think it is better than St. John's in its standing and job placement upon graduation.
I, too have a short time to decide if I will accept or recline their offer, but if you accept and give in your seat deposit and then choose to go elsewhere, then you can still get a majority of your money, if not all, back to place on the other school's deposit.
The area is pretty nice and a lot closer to the city than St. John's, which is an advantage for me since I work in the city and want to get to school on time the way I would if I went to Brooklyn.
Good luck on your decision. I hope I swayed you to attend Brooklyn.