Best speaker on used market around 10,000.00

Dear Bache, nice site and good luck to you.
Just to note, you spelled bass on your site's front page as base.

"Hi Josh. Visceral to who, you or Curleyques? Visceral is a very personal effect."

Hi Phaelon. That's a pretty widespread description. The dynamics in that price range typically have more bass slam. Whether this matters to someone is a matter of personal tastes. I assumed by what Curleyques said that it was one of his main priorities. But, of course, you're right -- it's subjective and it might be that he would be delighted with the bass performance with the big Maggies (the big Sound Labs are a bit out of his price range). They are no slouch in the bass, good to 25 Hz, and will beat all but very large dynamics.

My personal attitude of course is who cares, you can always add a sub, or the Maggie woofer. :-) And I much prefer the naturalism of planar bass. I haven't heard the 20.7, but the smaller 3.7 has superb bass performance.

Not sure what your personal tastes and tendencies are, but of all the speakers I've auditioned over the past three years during my own upgrade search there are three speakers that stood out on top that would qualify.

1) Revel Ultima2 salon or studio. Hands down one of the best speakers I've auditioned

2) NOLA Baby Grand. Spectacular. Superb speaker and a soundstage to die for with an open baffle design.

3) Wilson Sasha. Sounded just right.

I auditioned B&W 802 diamonds also and I'd rate them my #4. At this level these speakers are all truly magnificent. It's about what nuances or WAF you prefer.

And just to be clear, the Revel Ultima Salon2 bass slam and extension made my jaw drop. The bass drums in Copland's Fanfare for the Common Man in my collection was amazing. Played other classical and soundtrack pieces. Hands down best bass slam. And it wasn't just slam--it was incredibly clean and tight bass.

Like other have mentioned as well I would include Totem wind on your list. But IMHO a pair of Wilson Audio Watt/Puppy 7 speakers can really rock.