Amp Recommendations

If those Sonus are on the warm side and efficient I would get a stereo or mono Benchmark AHB2. Used prices are under $5K for the monos. The Benchmark speaker cables are actually very good with these amps. I ended up using the Audience FrontRow speaker cables but the Benchmark SpeakON cables are really good and cost nothing compared to the FrontRow.

The Schitt Tyr seems intriguing ever since I bough the much lower powered Aegir amp. My Aegir is now my long term headphone amp. The Tyr is more powerful and is said to sound similar to the Aegir.

I just got their new headphone amp/preamp (not delivered yet) to go with the Aegir. Schitt is now a company I assume that their top end gear will sound great.

Check out Hegel.  All their integrated amps have HT bypass.

Thank you everyone for the suggestions, definitely have been doing my research on the recommendations above. 

@kota1 I have considered monoblocks and definitely not opposed to doing so. The Van Alstine have been on my list of possibilities. 

@wturkey While they are 4 ohm @ 90, they do dip down to 1.9 in the bass region, which a lot of amps have struggled with. 

I also worry about the amount of power required, as SF recommends 80-350W. When I was originally looking for new speakers, a local shop stated the Nova III was night and day difference with more power driving them and assumed that the Serafino would be the same way. 

1.9 ohms is rough. Not sure if AVA would be best for this scenario. Frank used to make amps with extra transistors to deal with low impedance speakers. Not sure if that’s the case nowadays. 
 

Odyssey Audio states their amps are good in low impedance situations. 
 

Sanders and Coda may be another option if Bryson is unsuited for the role.