New or used speakers

Yes used or demos. I have had good luck buying demos for my last two speakers. Saved about 40% on 99% new speakers. 
 

I think the key or buying used/demos is having 3 or 4 speakers you would be happy with abs jumping on them when they come up local. Also not being picky on color helps too. 

$10k used=up to $20K new. 

Of course, that price depends on condition, age and negotiation skills.

No shortage of great speaker listings. You're in the drivers seat with cash, be picky.

Used speakers like used cars give the best value.

myself look for very good speakers with quality drivers ,then I totally upgrade the wiring and Xover parts the biggest  weak point in all speakers including ones at even $30k+ are not much betterthen average parts ,like Mundorf Evo capacitors  ,decent but not even Mundorf Supreme quality  , Never mind World class brands like Duelund    put $1300 + into a Xover and it’s like buying a speaker 2x + the cost .

You don't have to spend anywhere near $10K to acquire great used speakers.    The compromise is that you might have to accept that the speakers were manufactured by a company that no longer exists.    If the speakers are good, you can usually find someone that knows how to rebuild them, if the need ever arises. 

How about ADS?    IMO, they included the best domed mid-range ever designed.  Take a chance....