IMO Sentry is the best in the area. I've bought 3 cars there. They've always treated me very well. Of course I'm loyal and particular. The fact that Omar has a Speed is just icing on the cake. He's particular too.
I've never been to Wellesley but see no reason to bounce from dealer to dealer when I have a history with Sentry. They're a great bunch of people from sales to service.
I saw a red 08.5 MS3 last weekend getting it's snows swapped while I was getting my wife's Mz5 serviced. It had a Red Sox plate on it.
Two reasons I've stopped going there ... first its a long haul for me and second one of the sales reps told me Omar (bowdown) is against "Mod's". I'm not that I'm heavily modified.
I plan on bringing it down there to have a look after OCC meet. Just a lot going on right now.