Never knew anything about Westboro, and I haven’t lived in MA for 25 years now (Makes me feel so old! :eek: ). But…
The Boston area, in general, is the nicest place I know in the US. I still sort of consider Boston to be my “second home” 
When I lived there, it was more along rt. 128 than out around I-495 – closer to the city itself, and you’d be driving against traffic both ways. So those are the places I know to tell you about.
Anyway – I lived in Newton MA. Lovely town, predominantly (almost exclusively?) white but with a very large proportion of Jews as well as Catholics (it was roughly a third of each, the final third being of various Protestant denominations), and very liberal. Right on the 'Pike, Rt. 9, Comm. Ave… and very close to Storrow Drive, too – excellent accessability to DownTown as well as to Cambridge. But I’d have to guess it’s mostly extremely expensive!
Going further west, Wellesley, Framingham and Natick have always stuck in my mind as nice, further-out-and-thus-cheaper-rent places. Try looking at them. Framingham is, I believe, the “World’s Largest Town” – an unincorporated (at the time – early 80’s) town of nearly 100,000 (unless they’ve incorporated since, I don’t know). It certainly seemed to me like a nice place; enough people to have all the services and amenities, but dedicated to keeping a “townish” atmosphere.
Another place you might want to look at is Watertown. It’s very close to Boston (one town over west of Cambridge, in fact; directly North of Newton), and was, way back when, relatively inexpensive and multi-cultural (lots of Armenians, if my memory serves). A bit far from Westboro – probably over 20 miles wither way – but going against traffic. And tremendously close to Boston itself, for when you want to get in to The City! Probably still less bang for the buck, accomodation-wise, than oulying areas, though.
'Course all of this is 25 YO info, so probably inaccurate both due to faulty recollection and to actual changes on the ground. But it may give you a few tips to start looking at. Real estate classifications and Demographics don’t change that much…
In general – MA rocks! It’s the place I’d go live (again) if I ever leave Israel. Go for it!
Dani