Sonus Faber Extremas

Heading to the CES and have high hopes for the Duetta by Wilson. Seems like the inverted titanim tweeter has been replaced, the only drawback I heard in the 7's and Sophias otherwise I would buy those speaker. Question is I enjoy tube amps and would appreciate any input on ayone who has owned Extremas. Demos are unlikely, they are hard enough to find let alone get a demo out here in South Fla. Could the Extremas be properly driven by amps or integrateds by Jadis or VAC? Sifting thru the threads Im reading 400 watts not being enough, and some even bridging to 800watts! Would a 60 watts Jadis class A or say the 130 watt VAC phi beta have enough current to make the extremas sing. Will throw in room size which I beleive is the key to this setup..20 wide 30 deep. Speakers maybe 6 feet away from wall. Listen only to Jazz and standards with a little classical on occasion. Thanks!