8 ohm speaker that sounds like sonus faber

Well you might consider the Wilson Benesch. They are 88db sensitivity and very tube friendly. I use no more then 45 watts to rock.

I assume it is Ok if they sound better then sonus faber.

We have shown with the Wilson benesch Curves at the RMAF for about 6 years and they are very well received.

We need more information. What price range? What type of music? I am using a Pathos Classic One (integrated 70 watts with tube pre) on SF Conterto and the sound is really intoxicating. If you want to drive Stradivari, that is a different story. But 70 watts of tube can drive lots of SF apeakers. If you want SF, 70 watts may be fine, depending on what level of speaker and amps you want. Before you look beyond SF, lets hear what you are trying to do.

More importantly, which Sonus Faber?

The old SF designs were MUCH, MUCH warmer than the recent desings. I own the old Minuettos and the more modern Cremonas. The former are examples of the old SF sound (rolled off at the extremes with a mid-bass hump). The latter are a more nuetral, extended, modern sounding high end speaker and are representative of what I've heard from all the recent SF designs I've had the chance to check out - specifically including the stand mounted monitors.

So you've got to specify which one prefer before anyone can make an informed recommendation for you.

Marty