Help - Opinions - Amp for Sonas Faber Olympica III Speakers


Haven't been here for a long time.
There are so many choices for amps. Thinking of going with a Nad M22 V2. Speakers are in a room 23x20 with 22 foot vaulted ceiling. One side is partially open to adjoining big room. 
I have looked at a lot of amps. Decided to go with lots of power and low ohm stable.
Thoughts? 
greywolf
Opinions please.
Looking at this amp  Musical Fidelity M8s-500S Power Amplifier; New w/ Full Warranty. 
Info https://www.musicalfidelity.com/products/m8series/m8-500s

Replace my Classe Sigma Amp2.
Info 

AMP2

FREQUENCY RESPONSE:

10 Hz – 20 kHz, -1dB into 4 Ohms

OUTPUT POWER:

200W rms into 8 Ohms, 400W rms into 4 Ohms

HARMONIC DISTORTION:

<0.018% @ 1 kHz Balanced Input

INTERMODULATION DISTORTION:

>80 dB below Fundamental into 8 Ohms Balanced

SIGNAL TO NOISE RATIO:

-100 dB at Peak Output into 8 Ohms (AES17)



Would there be improvement? Worth it for the cost?
Thanks
Yikes.
I would have gone Simaudio the III matched perfect with my 340ix.
I'm sure Moon is good stuff and I'm glad you're happy with it .....but,
The 340 is less powerful, doesn't tell you if it will handle low impedance loads. 
Spec wise the Halo JC5 is better IMO.