Good Speaker within a budget of USD10,000

That sounds like a decent sized room.  The most well-rounded speaker I’ve heard at $10K is the Revel F228be.  

The Paradigm Persona 3F is also worth a close look, as is the new Magico A3.  I preferred the Revels to either, but some swing the other way, and all are worth a demo.  

The Legacys mentioned above are another strong choice.  I haven’t had the chance to hear the Signature or Focus, but I was very impressed by the Aeris (though I’m not sure how much Legacy’s wavelet processor had to do with that). 

@jsm71 makes a good point.  Don’t discount the possibility of going with some standmounts and some good subs, though if you go that route make sure you get an integrated amp or processor that can do proper bass management and that has some form of room correction, such as the Anthem STR line.  

1 - Budget 10% to 20% of that on room acoustics.
2 - Brands, consider Monitor Audio, Revel, JBL, Focal, B&W. All different sounding.
3 - Also, think about what type of speaker. 
- Full range?
- 2.5 way? (the size of the room may make this a good choice)
- Satellite + sub? Again, ideal for the size of the room PLUS allows subwoofer EQ without messing your main audio chain.

Would you consider a bespoke speaker system? Makers like Fritz can accommodate a wide range of customization, and components for not too much cash.

http://www.libertyaudio.com

A complete System for about $ 15K 

From its maker 

Good Listening

Peter

Golden Ear Triton Reference