Finding Power Amp for Cabasse Murano

I have tried a few solid state options with my Cabasse setups, but in the end I went tubes to make those mid really sing. 

A Line Magnetic LM-6061A should give you sufficient power to drive these speakers.

If you really want SS, I think I would go with Exposure or SPL power amps as they give more refined sound. 

I'd seriously consider Cabasse's own Abyss amplier (less than 2k. new) Read the reiviews, you might find it worth considering. 

Fosi V3 Monos - 225 watts@4 ohms. 330@2 ohms. $249 a pair with the 48 volt power supply. Why spend four-figures?

Those are hungry speakers.  I would be looking at something large class A/B design.  I would be tempted, depending on where you live, to find something in the secondary market.  I have had good luck finding Nelson Pass designs.  One Threshold and one Nakamichi.  Both sound wonderful.  Another option would be places like "The Music Room" or "Audio Classics".  They go through things to make sure you aren't buying duds and have their own return policies.  I have bought from both in the past with no issues on some McIntosh, Audio Research, Rega and Sonus Faber. You can get lots more and $3k in the amp world can be a rough find. 

Here's a few possibles:

https://tmraudio.com/components/power-amplifiers/pass-labs-xa30-5-stereo-power-amplifier-factory-refurbished-1/

https://www.audioclassics.com/detail?detail=MC2500&nav=cat