Sonus Faber V's Sonus Faber

I can tell you that I successfully used Guarneris with Rel Strata III. This is a sealed box sub with tremendous flexibility. The Guarneri are very refined. Make sure you get a great deal. They sell here all day for $4500-$5500 used and this is BEFORE the next Guarneri is introduced.
As an aside, the Guarneri might be the most beautiful audio component I've ever seen.

Sir,
Your 30 watt Jadis would run the Guarneris in that room just fine. I will tell you that I had more success with them in larger rooms than small ones surprisingly. They like room to breath and will play "big" in a decent size room with a bit of power on them. I think they will sound very nice in your room. Make sure you get the shorter of the two pedestals that were made for them. I think the combination of speaker and stand equals about 51"