Agree, there is a ton on the market in dorchester right now and you can get a little more for the money.
One way to figure out where you should buy is by evaluating absorption rates ... essentially supply and demand statistics that will tell you if there is a lot on the market but not a lot of demand. I have posted some for Dorchester in other trulia voices posts and if i remember correctly, right now Dorchester has high supply but low demand. Anyway, my advice in a market like this is to just keep your options open and be patient with deciding ... It is a buyers market and the more you educate yourself the more likely you are to make a great real estate investment/emotional decision :)