The best speaker for a small room...at any price point.

Sonus Faber Guarneri in a vintage of your choosing.

@daveyf I looked at your virtual systems page and see you have your current speakers away from the wall. These speakers are getting some buzz and I am curious to hear them. They would not work for me because I like my speakers closer to the back wall with some distance from me.

https://vimberg.de/amea/

You did say price did not matter.

 @yyzsantabarbara  They do look interesting, has anyone heard these? Their small floor stander may also be a candidate.

The Vimburg are not available yet in my area, Southern Cal,  but the Canadian distributor said that they are working on bringing them into my area.

I would recommend you to have a listen to the TAD ME1. A real great monitor and in your treated room should be amazing. It is a little more expensive than the Vimburg with the non-diamond driver.

@yyzsantabarbara   I am also in S.Calif, so listening to the Vimburg's isn't an option yet either. The TAD's would seem to be an option, but also difficult to source for a listen. Plus, I am not sure i would cotton to the hard beryllium tweeter!  
This is why I have stayed away from the Magico line and others with 'ringing' dome tweeters. Presumably the Vimburg's wouldn't have this issue, but who knows?