Big, big room -- which 10-20k speakers?

Just some general thoughts on each of the five speakers you've mentioned:

a) Revel Salon 2s: I own these and am very familiar with them - see my virtual system for more info. Pros: soundstaging is outstanding - they disperse very well and so your sweet spot is expanded, a considerable asset if you seek to move about your large room. And certainly capable of filling your room. Also they are very neutral speakers that should do well in your glassy room. Cons: they are not very efficient and would quite likely require more power than what your Luxman would provide, especially in a room that size. A few have complained that they are lifeless, although I do not agree.

b) Wilson Sasha: Have heard these on several occasions. Pros: very nice in well-treated rooms. Excellent, propulsive mid-bass and very extended treble. "Front-row" sound if that is what you are looking for. A little easier to drive than the Salon 2s. Cons: not a paragon of neutrality. Humped in the bass and treble, and that latter quality may make them fatiguing in a glassy room. Don't soundstage as well as the Salon 2s, nor is dispersion as good. But they might have been my choice for a man cave.

c) Aerial 20T: have only heard once. Pros: good bass when properly fed (like the Salon 2s, they seem to need to feed). Very good midrange coherence. Cons: tweeter did not seem to disperse well, so restricted sweet spot.

d) YG Anat Studio II: have not heard. Plenty of reviews of them both from publications (which seem to like them) and show attendees (mixed bag, some say they are grainy and/or lifeless while others think they are neutral and/or revealing).

e) Rockport Mira Grand II: have not heard (but I would like to). Not generally a D'Appolito configuration fan myself, but both pro reviews and blogs from people attending shows seem pretty uniformly positive.

If you want to fill such a huge room and enjoy to listen close to life levels the speakers mentioned won't do the job IMO. Also you need speakers with a narrow dispersion. I'd like to suggest some used Avantgarde Omega Duos but you would have to add another set of 225 subs. Also a Luxman integrated, even though probably not the best amps, will have plenty of juice to fill that huge space with sound when using 107 db efficient horns

The Luxman 509u @ 120 wpc is too low powered to properly drive any of these speakers. You should consider more efficient speakers from DeVore, Silverline, JM Labs or Coincident.

I know that verity Audio speakers tend too do well in big rooms I think this has something to do with the rear woofer. But I a not sure if you amp is up to the job. I cannot say either way.

I think whether the 120 w/ch Luxman would cut it or not with the less efficient speakers would likely depend on listening habits, volumes, type of music, etc.

Having powered subs in the mix would help if needed.