I'll second the nomination for local retailer with Audio Video Therapy of Nashua NH. They're a little further from me than four other well-known-to-the-area retailers and just a couple miles from another who is known to be a brand importer in addition to retailer. Still, Audio Video Therapy gets most of my business because of the way they earn it.
For manufacturers, I haven't found many of the same calibre as KEF USA. I've not had any failures of the product, but for a missing (purely cosmetic) part on a pair of demo R500's and missing port plugs on a used pair LS50's I got from AV Therapy, they went out of their way to make sure I was happy. I have the T-shirts, pens, keychains, and other KEF-labeled swag to prove it.