My room is actually a bit smaller than yours. After many years of mini monitors, including several of those mentioned above, I have settled on magnepan LRS in a near field configuration. Love them. In small room near field the soundstage is unbelievable. You do have to pull them 3 feet from the back wall, which puts me about 4.5 feet from panels to ears.
so consider a planar or electrostatic, even though this might be counter intuitive for a small room.