Plato
One of my Sound Lab customers was using full-sized (80" tall by 35" wide) Millennium-1's in a 12-by-12 foot room. At a listening distance of six feet or so, that's almost like listening to a giant pair of electrostatic headphones, isn't it??
Plato, I think the Sound Labs will probably come closer than any speaker to approaching the articulation of the Stax's, because they use the thinnest diaphragm of any electrostat (to the best of my knowledge). That being said, those Stax headphones are unbelieveably articulate.
As far as room size goes, 12 by 12 is a wee bit on the, ah, cozy side - but Sound Labs can work well in an unusually very wide variety of rooms because their voicing is less dependent on fine-tuning the relative contribution of the room's acoustics. This is because they generate a tonally correct reverberant field, which is something of a rarity among loudspeakers, but very common among live, unamplified musical instruments.
Yeah the Sound Labs are pricey, but from time to time I have used/demo models available. Check with me when your piggy bank recovers from the move and (I presume) Stax purchase!
Best wishes,
Duke
PS - By the way, are you the real Plato? If so, I really like something you said a long time ago: "Be kind, for everyone you meet is fighting a hard battle". I try to live by that.