Amp recommendation for RS6


Hello everybody,

I am searching currently for a new amplifier for my Monitor Audio RS6.
I have narrowed my options to the next amplifiers:
-Primare I21
-Creek EVO
-NAD C355
-Roksan Kandy mkIII
-Unison Unico
-Naim Nait 5i
but I also consider a tube amp (based on numerous suggestions that RS6 sounds best with tubes).

What do you think?
Any other options are welcome.
My source is NAD C542.
kerio
Tested RS6 with Naim Nait 5i and Audio Analogue Puccini SE.
Both amps acted very well but even the Naim was a little bit fatiguing in this combination,it brought much more openness,bass control,separation to RS6.
AA had a little bit more warmth ,the voices had much more body than Naim but the bass was somehow muddy and uncontrolled.Also lacked the dynamics needed to modern genres and rock.

I will also give another chance to NAD C355.If doesn`t work I will definitely go for Naim.
These are very good speakers with tube amps.
Something like the Ming Da EL34A/B would be great.These are superb sounding tube amps and an absolute bargain.Also great build quality,very quiet and have none of the soggy bass or lack of drive you find in lesser tube amps.
I do not think any mid priced SS amp would come close.
i'd also opt for tubes with the rs6, which can sound very forward and bright--perhaps something like the vincent hybrid or jolida would tame 'em.
Would a tube amp have enough power for these speakers? Any other recommendations to warm up these speakers. I have them and cannot listen to them for very long.