Resolution Audio (Opus 21 CDP) is very, very helpful. (Jeff Kalt is one of the Best! He did not even charge me for the minor repair I brought to him, nor for the toy he gave to my little girl. Top notch service in my book!!)
Basis Audio (2001 turntable) has been very good with help and advice as well. (A.J. Conti will answer any question and offer any help he can. His products are not cheap, but you have a good guy by your side when things need to be done.)
Ayre has also been very helpful. (Hopefully this will continue as I will be sending in for the evolution upgrade soon.)
Also, Mark Levinson and Revel, at least in the past, treated me very well and professionally. (Most of this was before the big move, but some of it after.)
As far as dealers go, Brian Hartsell, with The Analog Room, in San Jose, CA, has bent over backwards to help me, even when he wan't making a dime, as there was not a sale involved. Great Guy.