I'd be a little careful with small, low-cost amps. Your speakers are nominally 4 ohms with 87dB sensitivity. In addition, there are pretty wide swings in impedance and phase angel. All of that implies a pretty hefty power supply may be needed. Traditionally, high end Sonus Faber speakers have been hard to drive. It is not just having 50 watts of stated power. I have Cremonas and found that even pretty hefty amps did not do them justice. Class D may work better than AB. I have no experience with your speakers, Just a something to consider..
Budget Amp for Sonus Faber
A bit of an odd request here so bear with me.
I have a pair of Sonus Faber Guarneri Traditions and currently have a Parasound A23 amp.
I mainly want to get a different amp because my table isn't big enough to fit the Parasound and frankly I think it looks pretty bland.
I'm in the camp of all reasonably well made amps sound the same, so really just looking for a small footprint but also very attractive / clean looking amp that will fit on my table. Ideally footprint of no more than 12 X 12 inches.
Tube or SS doesn't really matter. Would like to spend under $1000 but can stretch to $2000 if needed. Just need at least 50W.