Amplifier for my new Focal Sopra no2

Yes indeed. Adding a Naim external PSU will significantly improve the sound quality and musicality.

Or alternatively there’s always room to upgrade to a higher end Naim standalone analog linestage preamp with external PSU and a separate Naim streamer + separate Naim DAC as well as upgrading to a higher end Naim power amp with external PSU, which will take the overall performance and musicality to a whole new level.

This upgrade path thing of Naim is both good and bad.  Audiophiles always want to try something different and new, and Naim limits them from connecting gears of other brands.  For instance, cannot connect with balance inputs/ outputs.  

the Sopra N2 were voiced with the NAP 300DR, I’ve owned the Sopra N2, N3 and now Scala V2's and all sets I used the N272/555PS with a 250DR, 300DR and now N272/555PS/500DR, the 300DR is a very nice setup with the N272/555PS and don’t waste your money on a XPS

@syk

My Naim Statement gears have regular XLR balanced, RCA single-ended as well as DIN connections. For example, my Naim NAC S1 linestage preamp has 2 XLR, 3 RCA & 3 DIN inputs and has XLR, RCA & DIN outputs. And my Naim NAP S1 monoblock amps each has 1 XLR balanced input on each amp.
So it tells you that you can connect and mix match from and to other brands.

I know that some Naim lower end gears (non Statement gears) have only DIN connections. However, I also own a Naim Uniti Nova in my bedroom setup and the Uniti Nova has regular XLR & RCA connections.

@atekelidis was right...the newer Focal speakers such as the Sopra no 3 and no 2 were voiced using Naim amplifications and electronics ever since the merger of the two.

JC1 monoblocks fed by PrimaLuna EVO 400 tube preamp here, fed by AURALiC G series digital.  Have had the Sopra N*2 for over a year (in Audi Blue), and just love these things.  The PrimaLuna puts a nice color on the sound, and the JC1s love some tube goodness at the preamp level.

Naim is awesome, but so many other options sound JUST as good or better (and many worse), so there is no "best pairing".  Stay open.

BTW, I think Moon amplification (400M) is a bit over rated.  I put up a pair of their monoblocks next to the JC1s and BHK 300s, not even close.  Just my opinion, of course.