I agree that the Women's Health Assoc midwives are fantastic! But I do find that they are a little more conservative these days as they have had some issues with a few OB's that back them. I have had personal experence with this recently, not only with clients but for myself as well.
I really like Mary Baker and Michele Helgeson at Harvard Vanguard in Wellesley (RT9). I find they are open minded and have a couple of very supportive OB's in their practice. They have been great to not only myself in the past and present (I go to them for all my well woman care) but are very compassionate and willing to meet moms halfway with things like an altered prenatal schdule for visit and giving options and alternatives to things like the glucose tolerance test (you can also decline, as well). It might me be good to meet with both set of midwives and decide which practice suits you, your personality, and birth wishes.
Feel free to message me if you have any questions.