The guys at Pennridge (Joe and Phil) have a good reputation, but you'd probably be well served to have someone who has not previously worked on the plane do your pre-buy.
I think that the shop at Sky Manor N40 is also good (
www.skymanorairrepair.com [
skymanorairrepair.com]), although I've only really used them for avionics. N40 is only about 15nm from DYL.
