I listened to the Cary V12 for a long while one day playing big Soliloquys (6.3 I think) and it sounded very good. I also heard a Unison Research 845 integrated playing Royds that sounded even better - downright impressive and bizarre. I have also heard at length a McIntosh 6900 playing Vandersteen 5 that was to die for. Actually, it was the most versatile sounding of the three systems (I heard them all about the same time) in that it could really handle wall-shaking bass and the vocals were still beautiful and liquidly real. The layering was incredible and gave a sense of amazing coherence. Anyway, if one day I want to trade-in my little McIntosh separates, I may have to get a 6900. I just love it.
Depending on your taste in music, this may or may not be the case for you too. You will have to experiment and see, but afterall, that is a large part of the fun. As a final note, your Thiels will like the McIntosh's effortless power very much. Good luck! Arthur