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

Thanks so much everyone: there's an a great amount of info here to parse through and I'll spend the next few hours researching everyone's suggestions.

One feature that attracted me to the YGs was that they incorporate active amplification for the woofers. Has anyone heard these in a large room?

I'd also love any thoughts from the community on Wilson Sashas or any other speakers that might do well in a big room in that (used) price range.

Thanks so much everyone. I am now more confused than ever! I especially appreciated P59teitel's extensive discussion of the pros and cons of each speaker I had put forward. I'll also explore some of the other suggestions kindly proffered. I'll make sure to post back with an update later.

What terrific feedback! Thanks so much everyone for your help with this.

In answer to a few of the questions asked above:
- I have fairly eclectic musical tastes. I listen to old folk and country (think Bascomb Lamar Lunsford and Ralph Stanley), jazz (Jarrett, Monk), rock (Pixies, Patti Smith, M.I.A, the Dead.), symphonic classical, opera, world (mainly Japanese since I lived there for so long, and Brazilian of the quasi-jazzlike Milton Nascimiento variety). I really would not want to have my system be a major impediment to listening to any type of music

- My normal listening position will be about 12-15 feet from the front wall (which is actually windows) and slightly off-center. We will also use the room for entertaining a few times a month so being able to fill the room with low to moderate volume music would be useful

I am totally unfamiliar with horns. Would something like Avantgarde Trios with subwoofers be a good approach? I'm a bit concerned about the bass module crossover, and soundstaging

Thanks again for the advice! I've already spent hours searching the web trying to form a view on everyone's recommendations.