I think that the most important factor in choosing speakers, assuming that you can afford them, is that you like the way that they sound. You said that you listened to other speaker brands, but have you heard NHT, RBH, or Axiom speakers? If not, preview them if you can. I think that Axiom allows in house trials with a return policy. If a vendor in your area carries NHT and/or RBH, give them a try. I have NHT speakers (bought them over nine years ago, since discontinued). At the time, I thought they were better than the others that I had heard in my price range - B&W, Paradigm, Definitive Technology, Polk, Infinity, and I'm sure some others. They are what I preferred, but people buy the other brands because they are what they preferred. There are also other good internet direct companies, like Aperion Audio. I have a friend who bought a set from Aperion and he is very happy with them.
I think that all of the companies that you mentioned will back their products, so you shouldn't have to worry about that as a factor in this.