Sonus Faber Amati Tradition - How Many Watts Optimal?


Hi all,
I own a pair of SF Guarneri Evolution driven by a pair of Mcintosh MC75 MKIII and C22 and realized my room is too big for bookshelf. Just like many younger generation (I am 39) I like strong tight controlled bass while at the same time just like many audiophile I am always lusting for midrange to die for, so I have been lusting for Amati and last week during an audition in my local dealer I saw a brand new in box pair of Amati Tradition for a price I couldn’t refuse and I put a deposit. Now I am wondering about what amps I should drive my Amati Tradition with? I suspected it’s not an easy speaker to drive with 4 ohm impedance, sensitivity is quite high at 90db though, spec recommended 100-500 watts.

I like Mcintosh amps very much but I am not fanatical, initially I was thinking about driving the Amati in biamp while still utilizing my MC75 plus a pair more channel from new amps to save some dough but opinion seems to be divided in the middle regarding bi amping and it’s a big gamble for me to go bi amp considering the cost of extra cables.

What amp should I consider? I live in Indonesia so I don’t have much choice in regards of brands. I can easily source Mcintosh, Audio Research, Gryphon, Audio Note, Cary and some other more typical household brands. More exotic brands such as D’agostinos, Pass, T+A, Ayre and the likes are hard to come by and audition.

Lately I also been flirting with the idea of going integrated to keep cost down while keeping my previous system as second system and build an entirely new system around the Amatis, but I am still open to any suggestions because I know I will have difficult time explaining to my wife why I need two systems. LOL

Thanks in advance!
uwiikz
Hello,
I know this might be a stretch. What about the Rouge DragoN. This is a SS amp with 300 WPC at $4000 USD. It uses new tech and even though it is SS it has a warm tube like signature. It is designed by a tube based audio company. I know your budget is higher but this might work. 
Thanks for the suggestion, unfortunately there are not so many brands available in my country right now. 17 or so years ago I could find almost every well known brand here but not anymore. Most dealers are sticking to the more common household brands from big corporations such as Mcintosh, ARC, PSA, Gryphon, Audio Note, etc. Rouge was actually on my mind before I bought my latest gear but I just couldn’t find the dealer anymore. 
I don't have the Amati Tradition but I had both the Olympica III and the Amati Futura. I used Symphonic Line solid state 100 watts pure class A, Audio Research Class D stereo and monos, ARC Ref75 and ultimately REF250 SE monos.  I thought they sounded wonderful and musical on soldi state but I am still a tube fan. I loved the REF75, was really magical.  I went up to REF250SE monos, because it was one more layer of detail and more open. Dynamics were awesome on a wider range of music and I am building a large sound room and was planning ahead a little. Hope this helps. 
So with the Amati Tradition Homage speakers that I had with the Raven Reflection, I never had to turn the volume past say 1/4 plus.  Or in clock terms maybe 10 o'clock.  Very rarely I would play at 50% volume which basically the neighbors could hear it.