@Pawqara: I will keep my fingers crossed that the funding issue will be resolved soon.
Here are the rates for campus housing. I feel like living with 3 other people in an apartment is fine as long as I have my own room
http://studentaffairs.stonybrook.edu/res/rates.shtml
I would definitely also live on campus, at least the very first year, to become familiar with the university and the students. Also, I don't want to spend extra money on commuting so I think on-campus housing is the best option here, even though it will cost around $600.
In any case, I am really excited about Stony Brook!