Amp / Pre-Amp for Sonus Faber Serafino

"I would like to get the best out of SF Serafino for the music i listen to..."

In that case, you may want to try D'Agastino Momentum M400 Monoblock amplifiers. They not only sound excellent but will also add a lot of "sparkle" to your listening room. I've heard them paired with the SF Aida speakers and the sound was truly exceptional. I think they were paired with Audio Research Reference6 preamplifier but I'm not sure.
Good luck with your search.    

 “When you steer someone away from it because of your beliefs which don't seem to match McIntosh's beliefs, you do that person a disservice”

Unfortunately this is a common practice regardless of the brand and not limited to any specific person. The question that was asked by the OP was about the sound quality not the design. He asked for a recommendation for “something extremely warm” and while I personally would not characterize McIntosh amplifiers’ sound as extremely warm but they do generally fall on the warm side of the spectrum.

I haven’t heard the Gryphon 300 but based on the reviews and owners’ input it is supposed to be an excellent integrated amplifier and most likely better than the McIntosh integrated amplifiers out there. The high end T+A integrateds also seem to be very well liked as well. I agree the OP’s speakers do deserve something really good.