MASSACHUSETTS: two more excellent shops:
Import Auto ; Braintree MA
Revolution Auto ; Norwood MA

Please add

Chicago (loop/downtown)
- Bavarian Motors of Chicago
Bavarian Motors - Near West Side - Chicago, IL | Yelp

Chicago (Irving Park/North Side)
- Bimmer Werkshop
Bimmer Werkshop - Irving Park - Chicago, IL | Yelp

Chicago (Morton Grove/North Side)
-NCA Motor Sports
NCA Motorsports - Morton Grove, IL | Yelp

Any reputable shops in Northern VA?

Ottawa Ontario Canada area

RJ Automotive Repair
34 Edgewater St,
Kanata ON
613-831-2273

Minneapolis
 

Imola Motorsports is a great indy. imolamotorsports.com

Initial post has been updated with all shops prior to this post. Thanks for all the shop info Xoutposters!

3D Autoworks Inc
1 Industrial Dr
Hudson, NH 03051
603-882-3400
If you're a BMW guy from New England you know Dan and Dave. Undoubtedly the most knowledgeable and best dealer alternative in this region. Dave owns a e53 4.8iS and knows these suckers inside out.

Located in the northwest metro Atlanta area...

Bimmer's Service Center
2486 S. Main St.
Kennesaw, GA 30144
BMW Service Kennasaw, Ga - BMW Repairs Kennasaw, Ga

They specialize in modern BMW's/Mini's from the mid to late 1990's and on. As far as I know, the shop is owned by an experienced BMW tech.

I'm not familiar with this shop out in kennesaw, NW of ATL, but my stepson, who I helped identify and purchase a 2001 3.0L auto E53, lives out the way, and I'll pass this rec on to him. thanks for posting!

No problem. I live about 10 minutes away and have taken our cars there multiple times for everything from oil changes to valve adjustments and have always been pleased. They can also get you parts, sell you oil, etc. Plus it's really convenient. The closest dealer to me is Global Imports and while they are fairly close (20-30 min without traffic) they are also very expensive in comparison. Now that both of my cars are out of warranty, I wont go anywhere else.