It's Magnepan 20.1's or B&W Nautilus 801's

For what ever it's worth I prefer the Maggies. If it's truly a toss up, perhaps what will work best in your room should decide. Ideally you could find a dealer that carries both.

Put me down as someone you don't like Diana Krall. Nice recording but no soul.

The B&W 801s will perform much better at lower listening levels and will sound better if you upgrade your amps with BAT tube gear to match your other outstanding BAT equipment, and run the system with balanced cables.

You'e got a great room, get the 801swell out into room and
you'll be blown away by the quality of the bass and the imaging.

Aloha.

Thank you all for a most illuminating series of posts. I found the first poster, Tafka_steve, gave particularly sage advice. It really is all about how our systems make us feel isn't it? While we get bogged down with specs and tests and others opinions, the best test of all is how they make us feel. Oh, sage advice ! (I have a book for you, Tafka_steve, that just hit the stores: "Strangers to Ourselves" that you would enjoy.)

The other advice was all good as well and I am not surprised by the number of posters favoring Magnepan. As to the other speakers I have listened too and eliminated:

JM Lab Utopias (too expensive, even used, but very, very rich sounding; mellowness without being mushy; highly detailed but not as good a sound stage width and depth as the Magnepans. a very nicely integrated base which was never overpowering but alweays tight and transparent. I could listen to these speakers forever. What warmth and clarity. They really moved me.

JM Labs Mezo Utopias (within my price range and excellent sounding speakers but once having listened to the Utopias, I could not chose them. I would constantly sit there and think, "If I could have just stretched a little further and got the Utopias !" The difference was quite evident in favor of the Utopias - again a richness of sound that I have seldom heard.

Martin Logan Prodigy: Lovely speaker, bright clear mids and highs, plenty of base but the base did not seem as well integrated as on the other speakers I listened to.

Magnepan 3.6 R: Lovely, lovely speaker as well. Fantastic soundstage and depth. Pinpoint imaging. Lacked punch in the base on some passages but very close to what I want. These speakers disappeared and I was simply "there" with the music. Addition of a subwoofer gave more base but sounded out of place and disconnected to the rest of the music.

Unfortunately I was not able to locate a set of Alon Circe,Sonus Faber Amati Homage, or Revel Ultima Salons.

Thanks again for all of your suggestions and advice.

Rooy3

I prefer the Maggie's for many reasons. However, your room could be problematic for the immense 20.1's. I think they need even more room to breathe and open up, but it might still be manageable.

You certainly have enough power to drive them, but I would also consider something a bit smaller. I am not a fan of the B&W's at all, so I will make no further comments regarding them.

You talk about a 10 foot peak in the ceiling, but what is the shortest part of it? Where you envision the speaker placement, do you really have enough height?

Your music preferences certainly lean toward the Maggie's. What did you like most about the B&W's? What did you not care for with them? I also would ask you to answer the same questions with regards to the 20.1's.

I agree with a lot of comments here but have to say I do have personal experience from the perspective of the same sized room (approx). I've owned the 801N's and Maggie 3.5's. I'd like to urge you to listen to these both before you purchase them IN YOUR ROOM. I know this may be difficult but I can tell you my experience with that size room, especially with the B&W's are that you will be encountering some standing wave/room reinforcement issues. 801's need a large room to breathe, maybe even more so than the Maggies. I had mine for about 6 months, tried everything to get the room to sound better, then sold them at a huge loss. The bass was so overwhelming that it smeared the midrange and the imaging.
IN retrospect I would have purchased the 802N, which I compared very closely side by side with the 801. It simply would have worked better in my room due to quicker, tighter bass. I ended up with Wilson Sophia's which I think compared very favorably to either : )
BTW, I miss the Maggies more than any other of the dozens of speakers I've owned over the past few years : ) As the reviews say, in some ways the best out there, even the 3.6's. I had them dialed in a "trick" room which opened to another room with part walls on outside of the speakers and managed a soundstage depth more than I've heard ANYWHERE (50 ft+) with NO room treatments. Rowland amps and pre, and accuphase and Goldmund digital. The only thing about the maggies is you need to get a good sub to integrate, and they don't do weight and body like good dynamic speakers. And slightly blunt leading edge transients. Everywhere else they rule though. Going to the 801's after the Maggies was a major disappointment. They sounded closed in/boxy? and lacked detail, transparency, soundstage, believability. Just my experience/opinion, may have been supporting equipment had something to do with also.

The Wilson Sophias are like a hybrid between the 801 and the Maggies. Very musical, imaging from hell, dynamics well beyond the 801, and sweet, forgiving sound like the 801. As others have posted, what counts is your opinion, your listening preferences, equipment and room. Either speaker would be terrific. It's a lot of money, so listen to everything you can in rooms as similar to yours with your equipment. I've trucked 200 pounds of amps into dealer showrooms so I could hear them on my own rig>