I do most of the work on my e34 M50 myself, but when I have a job that I don't have the tools for or is just too complicated or labor intensive I take my car to Chris at JCL.
Chris is the most knowledgeable BMW mechanic I have ever met; he knows all the intricacies of every model from the 2002 to models of the showroom floor. He is easy to reach all the time, and is an honest guy willing to give you straight up advice about what the best course of action may be, even if it doesn't help his bottom line. I recently moved from PA to NY, but I still plan to make the two hour drive to JCL if I need any major work on my car. Chris is that good.
The prices are reasonable and the service is great, this is hands down the best shop I have ever frequented.