For me it would be the Revel F36. I owned a set last year while my Magnepan 3.5's were being rebuilt. My room is a similar size (21 x 19 with a cathedral ceiling that tops out at 18 feet and open to other rooms). I found the F36 to be transparent without any excess brightness, slightly warm in the midbass, and good extension. They got plenty loud powered by a Schiit Vidar (100 watt/ch) and were pretty tolerant of less than perfectly mixed music. They are sensitive to side wall placement (Revel makes their speaker to maintain output to the sides, so if placed close to side walls, treating the first reflection point makes a big difference).
Traditionally, I have found Focal's and Sonus Faber to be too bright. Dynaudio have usually been pretty laid back. Like you, I listen to mostly rock/alternative, so prefer a warmer sound.
I will throw out two speakers that may be worth considering. A used Vandersteen 2Ce Sig II. Vortex Acoustics VR-22 ($2800 new) or used VR-33. Vortex Acoustics is Von Schweikerts directly sale speakers and are designed to be run close to the front wall so they take up little space.
Traditionally, I have found Focal's and Sonus Faber to be too bright. Dynaudio have usually been pretty laid back. Like you, I listen to mostly rock/alternative, so prefer a warmer sound.
I will throw out two speakers that may be worth considering. A used Vandersteen 2Ce Sig II. Vortex Acoustics VR-22 ($2800 new) or used VR-33. Vortex Acoustics is Von Schweikerts directly sale speakers and are designed to be run close to the front wall so they take up little space.