I owned the 6s for over a year. I liked them a lot. The one negative thing I found, was that they need a high current amp to get them to come alive. I tried a number of amps, Krell 300i, Classe CA151 and Bryston 4BST. The amp that got the most out of them was the Bryston, although overall I wasn't happy with the match. The Classe was much sweeter sounding, but the dynamics were missing and the speakers sounded lifeless. I have heard the other models you mentioned and in my short experience with them found the same to be true. So, as with any amp, sytem matching is very important. The problem here might be that your amp choices will be limited, and any future changes will be very speaker dependent.
