B&W Nautilus 803 or B&W 702 S2?

Huh, that's interesting.  I am a B&W owner and had the D2 and now own all D3s.  I have the complete opposite experience from you, caphill.  My B&W D3 are extremely engaging for music and are very rich and full sounding.  It at all, I would say the midrange is slightly laid back when compared to other more forward speakers, such as Monitor Audio and such.  I think it may be a synergy with your amplifiers / cables.

Like I have already mentioned above that yes the D3 is more refined and have different sound profile than the D2 and indeed more musical than the D2 but they are still other speakers that cost less than the D3 but more engaging with music.

As far as synergy.....well, my B&W 800 D3 are in my dedicated home theater room strictly for home theater duties.
I drive them with the Classe Delta CAM-600 monoblock amps (class AB) and they sounded terrific together. I am using Transparent Reference speaker cables for them.

However, I have also tried driving them with my other amps that I have had in my separate dedicated reference 2ch room. So we literally dragged my B&W 800 D3 over to my dedicated 2ch listening room and had them hooked up with a pair of D’Agostino Momentum M400 monoblock amps before with the ARC Ref 10 linestage preamp + DCS Vivaldi full four stacks served as my digital front end as well as the Kronos Pro turntable + ARC Ref 10 phonostage pre served as my analog front end. I had some people help me with the move and placements and everything as the 800 D3 are big and quite heavy.
And when I compared them to my previous Wilson Audio Alexx that I had in there at the time, no comparison.
My speaker cables are Transparent Magnum Opys. Interconnects and power cables are Transparent Opus.

Recently I went through a significant upgrades with my stereo setup that I have in my dedicated refetence 2ch listening room. I traded in the ARC Ref 10 linestage pre and the D’Agostino Momentum M400 monoblock amps for the Naim Statement gears which consist of the Naim NAC S1 linestage preamp and the Naim NAP S1 monoblock amps. I also traded in my Wilson Alexx for the Magico M6. But I keep my DCS Vivaldi full four stacks as my digital front end components and I still have the same Kronos Pro turntable with the ARC Ref 10 phonostage pre.
Last week we had my B&W 800 D3 dragged over to my reference stereo listening room again and had them hooked up to my new Naim Statement gears and compared them to my Magico M6. No comparison. I know it isn’t a fair comparison as the Magico M6 cost $176k a pair and the 800 D3 cost only $30k a pair.

Hmmm, seeing as how the Wilson Audio Alexx comes in at $109,000 retail, I don’t think that’s a fair comparison either.
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So, when comparing the cost of a B&W 803 D3 at $17,000 a pair. What speakers would be better AND cheaper?!?
Or even the 804 D3 coming in at $9,000.
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Ultimately, I don’t think I can come close to the performance of the B&W speakers at that cost, especially with the diamond tweeter. Now, beauty is always in the eye of the beholder, and there are definitely other speakers that are engaging, but they all have different characteristics. I have seen the brand Joseph Audio mentioned as a very competative speaker. They use the Seas Magnesium woofers and the Seas softdome tweeters. The Magnesium woofers have extremely high resolution and really "sing". They are definitely very engaging, but they do have a resonance peak at 5khz that can affect things and could contribute towards a slightly "metal" sound. The softdome tweeters are excellent and also "sing", but they do put a slightly tube like signature on the highs that are not their with the B&W D3. B&W D3 are slightly more laid back in the midrange, but have significantly more clarity in the highs.

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In the end, it all depends on what you want and what your preferences are.

IMO the Sonus Faber Olympica iii ($13,500/pair) and the Olympica ii ($10k/pair) are more musical or I should say more engaging with music than the B&W 803 D3 which retail for $17k/pair. My friend happens to be a dealer for both B&W & Sonus Faber and one time we had shootout between the SB Olympica iii and the B&W 803 D3 at his shop. Both speakers were paired with Classe Delta CAM-300 monoblock amps (class AB), Audio Research Reference 5 linestage preamp and a Naim ND 555 streamer/DAC + Naim 555 PS DR separate power supply unit.
So all the electronics are of high bars and we sat down for at least 2 hrs listening and comparing between the two speakers. We found that the SB Olympica iii is more engaging with music especially with piano and string instruments. But when we fed them with high resolution materials of great recordings we found the 803 D3 to be quite engaging and it’s got to the point where I can easily live with them with high resolution materials of good recordings.

@caphill - just following up.  I did get a chance at RMAF (first time) to hear a bunch of speakers.  The Sonus Faber are definitely an excellent sounding speaker (my friend has a set of bookshelves mated with all Krell Evolution generation electronics that are excellent as well).
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On the B&W D3 note, I heard the 800 D3 in three different rooms.  The main B&W room had Simaudio Moon (if I remember right) and the sound was very clean and clear but did still have a little of that Class A smoothed over sound in the mids.  The second room was even more smoothed over.  In the third room, the 800 D3 sounded so bad that if that was my only exposure to B&W, I would totally walk out of that room and forget about B&W forever.  In actuality, I have to wonder how many speakers I heard that I would have thought sounded amazing, but were compromised somehow by an overly colored tube or too-smooth Class A amp, lol.  In reality, I love my B&W D3 at home here and was surprised that my system actually beats the crap out of a LOT of the RMAF rooms.  There were probably less than 10 rooms that actually sounded great to me.  Many sounded "nice", but just didn't reach that amazing level.
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I did hear Wilson bookshelf speakers and I will admit they were pretty damn great sounding. It was tube gear, so it's difficult to know how they will respond on Class AB solid state. 
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@topedwards - hopefully you listened to a lot at RMAF.  I would caution wit the Focal speakers.  I think they would be just fine with your McIntosh, but the Focal are fast and definitely have a thin/hollow midrange and midbass.  They would likely do very well with a Pass Labs full Class A, but your Mac will have a very laid back midrange and could be a great synergy.  I think you probably want a very high resolution to mate with your McIntosh.  Focal would be great.  Others that I have heard could be B&W D3 or Audio Physic.  The Sonus Faber definitely sounded good with McIntosh, but they are not the most detailed/forward speaker.