I have heard all these speakers, and they are all excellent in their own way. The Dynaudio to me were very nice, neutral presentation, B&W 803d very....Well B&W I guess, which I love. The Verity, simply awesome, but in a different price range.
In the end I choose 803D, because thats my preference. In fact, after hearing them, I quickly sold my old speakers and put $5k down on a new set-should have in a month. But quite honestly, I wouldn't complain if ended up with any of the speakers, they are all excellent.