I am a Buyer's Broker in Boston specializing in single homebuyers. I'd be happy to recommend streets and give you some advice on neighborhoods in Dorchester. I have access to and can show you anything on the market at no cost to you. You can do a free search of current listings or have them emailed to you nightly based on your criteria at my website. Learn more about why you should use a Buyer's Broker and the pros and cons of buying vs. owning at http://www.paragonproperties.com/ownyourhome.htm.
Best of luck with your search!