What used speaker would you buy with $20,000-$35,000 and why?

This seems like a DIY forum.  Very few folks here seem to want to build their own or have to buy three amps just to power a two channel system.  I'm not putting them down, but just like we've pointe out in other threads the cost of your system goes through the roof supplying top amplification for them.  

Example:  I have a pair of Vandersteen Treo's.  They were in the price range at the time (8K).  I also own an Ayre AX5/20 integrated amp (cost 13K)  

If I had to run the Treo's with three channels of amplification, I'd have to get amps that sound as good or better than what I'm using.  That would also mean getting rid of an integrated that I love.  I'd have to sell my integrated for a loss. Then it's off to get three Ayre mono block amps (yes, I like the zero feedback Ayre amps a ton).  Not even sure how much they would be, but then I'd also have to get matching speaker cables and that's another 2500 per channel (but since I already have an 8' run, I'd only need two more runs for a total of 5k).

The argument  that I could just run an NAD or Rotel or some other lesser amp is wrong since that would completely degrade the sound even if those amps were running world class speakers.  Same with lowering the cables (although not nearly as much degradation as the amps being lowered).  

At some point practicality has to come into play too.  I haven' heard these Linkwitz so I can't say that I like or dislike them.  I do want to give them a go one of these days. Just my opinion (and I'm not the only one as a few folks have emailed me about this thread and another one questioning the DIY thing as well as tri amping) and I'm not trying to say that I'm right and you are wrong, so try and read it in that vein.  Thanks.

Good points ct, and all true. I mention the DIY OB subs only for those already contemplating the Linkwitz loudspeakers, as they too are available only as kits.

I would suggest a used pair of Krell Resolution 2 speakers.  I prefer them over the WP 6's and B&W802D2's I owned.  Spend the extra money on cables, amplification and a great source!

I definitely agree with Almarg & rzado re. seriously auditioning (with a preference to buy) a Sound Lab ESL speaker.

whatever you do make sure that you get a time-coherent speaker (most of the speakers on your list are not time-coherent). The Sound Lab speakers are time-coherent. You mentioned Vandersteen - yes, these are time-coherent too & a very good choice.
I would also like to add to your list Green Mountain Audio - if Roy Johnson (owner) is still making their 3-way Calypso then that speaker would definitely be on my short list.
And, of course, i will highly recommend an Apogee speaker - Scintilla 1-ohm version. Nothing short of the best. You have an amp with cojones to drive a 1-ohm load so no issues there. 

In my experience time-coherent speakers sound the very best - realistic sonics, hours & hours of non-stop listening, zero listening fatigue, very long-term enjoyment, every CD/LP sounds great & as the electronics gets better, the music playback gets better. Whenever I’ve heard the Green Mountain Audio speakers in my room (when i owned a pair) & at audio shows it always sounded like a live band playing in the room.

OP's question is mildly amusing on many levels. The thing is, no matter how much one spends on speakers, how does that correlate to the basic notion of simply enjoying the music?. 

Is 20 +K some sort of arbitrary threshold?  My daily driver (aka car) cost less than 20K.

Does a "previously owned" 20K speaker do the job?  Or do you need to spend 25K?  And,  what if you expand your budget and include used 30K speakers?  What if you go the "cheap route" and buy speakers for under 2K and put the rest of your  money into a retirement account or donate it to a worthwhile charity?

Audiophiles... god bless 'em. Or not.