Maybe these comments arrive a bit late but... Like with any system when it comes to synergy of components I would tread cautiously in matching speakers and power amps, yet to my mind that may well evoke the most rewarding musical result in adding tubed components in one location of a system. A tubed Pre is maybe better added to tubed power amps for many reasons IMHO. Although I differ with some on what is THE most important single component, my choice being the source, hands down. If you don't recover the music, how can one amplify it? That said, the recent addition of Atma-Sphere OTLs to my system was profound and astounding. Best of luck Holderlin with your search.
Happy Listening!
Happy Listening!