What tube amp for Harbeth 40.1

I am looking for a tube amp for Harbeth 40.1.  I know many suggest SS amp such as Accuphase, Luxman, Hegel, McIntosh ... etc for Harbeth, but I decided to keep it with tube.  I also don’t think I need a lot of power.  I currently have a 8W custom built 300B and had a 18W Almarro 318B, and to me, they sound fine.  However, I think more power will help, and I never know what I missed until I try it out.  Having said that, I don’t think I need crazy power.  Anything 30-80W is good enough for me.  I am 3m away from the speakers, listen to Jazz at avg 83dB.

i have the following short list:
1) PrimaLuna Evo 400 integrated
2) Leben CS600X 
3) Linear Tube Audio Z40

Which one do people like with Harbeth?  Any other suggestion?

Among all qualities, I value holographic presentation the most.  I really like the feeling as if the singer is floating in front of me, if you know what I mean.  And my current 300B do pretty well in this regards, and I read this is what SET amps are good at.  Will I be disappointed with the above?
Yes, I read good reviews on Line Magnetic especially the 219ia.  But I don’t feel comfortable with the super hot 845 tube.  One of the reason I sold my Almarro 318b is because of the heat from the 6c33c.  
That is actually a question.  Does any of those amps I short listed run super hot?
All tubes run really hot, the more power the more heat dissipation.  I love Border Patrol with Harbeths but that is a lot of tubes.
You could consider a hybrid amp?  Tube for gain stage but SS output.  That will run cooler (rogue sphinx for sale here).  Class A amps are hot too.
Gte I have heard the LTA amps at shows.  The ZOTL design sounds pretty much just as advertised and related in reviews.