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


I'm closer to the 20,000 part, but if I get stretched i would like to know higher recommendations. Remember, this is on the used market - not retail. I'm even interested if you think I should make a huge jump (say to 50,000), but I want to know what justifies that jump. I'd like the best bang for the buck and even the worse bang for the buck. Are there speaker lines that are totally overlooked that sound wonderful in this price range that I need to be exposed to? I may go higher, but lets start there.

PS Let's just assume the upstream equipment is adequate to drive any recommended speaker. We are not limited by upstream components.
Ag insider logo xs@2xnab2
I guess this is just the type of question that stimulates every "I-haven’t-heard-anything-like-my-last-speakers" speaker’s owner (just like me in fact).
How lucky you are to be able to ask such a question. And also to cope with the multiple answers everybody can read here.
I’d like to thank many of the gentlemen who took time to answer (and pleasure certainly), because I discovered a few names I had never hear of. Linkwitz seems to be that one I read most. I’ll pay a visit to them when I’m able to, for sure.
Let’s come to the most personal view, which is the speakers I would recommend in such a case.
Difficult choice, because, I must confess, I will mention speakers I never owned myself, unaffordable… I’ve been lucky enough to listen to them many times in my favorite hifi dealer shop in Paris (I’m French btw). I never owned them because they were (when new) and still are on the expensive side of my possibilities. But I’m only 54 so I still have some hope ;)
I’m talking about the wonderful Cello Grand Master (http://www.celloseattle.com/ctdocs/prodserve/speakers/grandmasters.html) for their ability to play anything with appropriate physical impact ; and the extraordinary Apogee acoustics Grand (http://www.stereophile.com/content/apogee-acoustics-grand#tG3tSR5EHGxwW1Wt.97) for their airy and incredible sound (the Diva can do too, and are easier to find. Depending on you room’s size).
I live presently with the babies, Apogee Stage. In a small sized european style room they are marvelous, driven by a Cello amp and Wadia CDP.
That’s an old-fashioned advice, I must admit. But your question is nice to be answered ;)
I wish you a nice way to your dream, that’s probably the funniest path in life, after the first kiss to a woman you love. Then I’m pretty sure that once you’re set up with the speakers you’ve chosen, you will start thinking about how you will ask here: « I’ve got wonderful XY speakers that actually do more than well. What would you suggest for the next step? ». Am I wrong?
;))

I would get Magnepan 3.7i and the best tight subwoofers and crossover I could find. Maybe twin server subs like REL or GR research. I would have lots of money left over.

Also I really like the Volti Audio Vittora 5 piece speaker system with a tube amp. http://voltiaudio.com/vittora/. Very, very nice.
I have attended the annual CES for about 35 years. This year my vote for the best sound goes to the Magico S5. The imaging must be heard to be believed. I have seen a few used S5s on Audiogon. I would strongly urge you to have an audition if there is a dealer near you. 

I have no qualms with the other suggestions as they are all good but Magico has my vote.
Try the JBL LC310-1 speakers if you can find a pair , I bought mine for 50 bucks
We at Sunny Components have several ideas...

Eggleston Works Andra 3
Wilson Audio Sasha Series 2
T+A Elektroakustic TCD110 S