I listen to a lot of Americana music and so I search out music on the Lost Highway and Sugar Hill labels.
Pretentious winos w/ expensive tastes often get razzed for being label drinkers. I try not to be a label listener, but when (pretentiously) going through the racks or browsing online, seeing one of these labels will make me spazz out for a second:
Music and Arts
Not saying that everything on one of these labels is a keeper, but most titles are an interesting listen and very well recorded.
I've been listening to various Proprius(ous?) recordings while auditioning speakers and have found them to be of unvarying high quality. Also, CALA recordings seem quite well made to me, as do ECM. Finally, I recently found a recording by Teldec (Scheherezade, Masur/NYP) that was very well recorded.