Thanks very much for the update. As I said, I find your thread quite interesting and informative as well. Since I have a fair amount of experience with Sonus Faber monitors, and because they not only generally sound good, they generally have great eye appeal. Perhaps your better half might be amenable to at least looking at them. Your 590 would likely work very well.
Full-disclosure; My Lux 550 AXII is powering my circa 2004 SF Guarneri Homage and I think the synergy is excellent. Some "experts" have insisted that I need more juice on tap. Maybe, maybe not. I can listen for hours without fatigue or losing interest. I have a pair of REL T5x but they are not always plugged in unless I want to rock the Casbah.. But, stating the obvious- our hobby is so personal and subjective that only you and your wife will really know what works for you.
After many years of audiophilia, one thing I've learned is that tossing a lot of coinage at real or perceived deficiencies is not always productive nor prudent.
This wind bag now rests his case. :)