Hi Syaudio,
Would love to hear the Nautilus' someday...have not come across a set, but good to read your own thoughts on them.
as for Strads, i totally agree with you. The Strads sound great with medium power because of the "character" of SF. However, the Strads respond extremely well to high quality power...more in the bass than in the mid. But even the mid soundstage, "strength of presentation" will improve with high current.
I have truly enjoyed Krell with all of the various Sonus Fabers...but i have found i preferred other amps with the Homage Series. Martin Colloms and i believe Franco Serblin himself were supposedly using FBX700 when it was still being made. However, imho, i preferred the slightly warmer sound of Class A SS...hence why i went with Gryphon Antileon. I have heard (as suggested above) that Soulution is a magical combination. If you wish to go with highpowered tubes, Downunder has his system up here...and uses CJ Premier 8s which were totally overhauled by CJ (Teflon capacitors, etc)...275watts/channel. Good luck and please keep posting! Great system!