I am indecisive about choice due to room size

The truth is Duke and I are going about the problem from complementary positions.

The better controlled dispersion you can have, the less room treatment you need.

Still, I believe you are better off treating the room first, before undertaking the speaker swap game.

Acoustic panels are your friend 

Had a friend who worked at Stereo 
Exchange in New York . He once told me being able to have any system he desire , that the most important thing in a Audio System setup was Acoustics . Work on the acoustics of any particular room then worry about the hardware . That up to 70% of what you hear in a particular system is the sound of the room .The good thing of working your room is you do it only once . You can upgrade this or that of your system but what you did for the acoustics of the room never changes . Take care and be safe .

That up to 70% of what you hear in a particular system is the sound of the room

Absolutely!! Until you treat it, you can't hear anything. 
What I think happens is that over a long period of time, Audiophiles learn to hear past the room acoustics, but it's like watching a movie in a smoke filled room. 

I can also say that I've gone through a lot of hardware, but I've NEVER played merry go round with my room acoustics.  I've only added more pieces.