Howdy, I'm going for BBS as well, Microbiology track. I think I would prefer to live in an apartment in East Rock, but I'm also considering the dorms because they are closer to the train station (my boyfriend lives in NYC...). I haven't officially accepted yet but I heard that current students might be able to help hook up newbies with apartments that they may be vacating.
The dorms are probably better for meeting people in other types of programs; I think that there will probably be a lot of BBS events and such to help us get to know each other.