Yet another + for Audio Connection in Verona, NJ. And another one as well for Audio Classics in Vestal, NY.
As for manufacturers that go above and beyond when it comes to help and service:
Ohm Acoustics - Easy access to owner/designer John Strohbeen
Oppo Digital (I know they recently exited the business, but promised to continue to service their discontinued models, and based on my experience with their service department, I take them at their word).
McIntosh Labs - amazing support for legacy products.
Sweetvinyl (makers of the Sugarcube SC-1 and SC-2) - a newcomer, but my beta experience with them has been outstanding.
Conrad-Johnson
Vandersteen Audio - Easy to access owner/designer Richard V.
Morrow Audio