I happen to listene to a new Mac Integrated (the one at 75 watts) with the Cremona's and Auditors about four weeks ago and, INMO, it might have been the best top end sound I've heard to date. I can still hear the clarity, sound staging and realness of the top end. I had just heard a pair of Wilson Sophia's driven by Meridian and while it was good, it didn't jump out at me.
My experience with tubes is limited, but I did ask to listen to the SF Homage's with Krell FBP amps in the same room and the same disc, and thought it was very good, too, but it didn't light me up nearly as much. So, tubes and Cremona's and Auditors definitely won that srimmage. Good luck.