B&W vs. Sonus Faber

B&W on the other hand will grab your attention immediately. Once you take them home, YMMV.

B&W D3 are a very revealing speaker and can be picky with components.  The amp/preamp can make or break this speaker as I have heard D3 sound like crap or sound boring but also sound totally amazing.

The Sonus Faber are going to be more forgiving on bad or flawed components, so they will likely sound more "pleasing" in a higher number of systems.  But they are not going to be as transparent or accurate in the high frequencies as the B&W diamond tweeters.

I recently purchased the SF NOVA 5 after comparing them with several speakers including the BW 803 d3.  They were both excellent sounding, however the Nova 5 sound more natural to me with smooth high and mids,  and a well-definded base.   The B&W has more of a British like KEF.   I mostly listen to Jazz, smooth rock, and classical if that is any help. 

Seems if you have a Mac amp b&w speakers would work.  Did notice that 803s are rated up to 500 watts.  Quite an appetite vs 804s being rated up to 200 watts.  

I have the 802D3’s and they can put you right into the studio or venue where the music was made...startlingly clear, dynamic and full of presence!!  Image placement and solidity are uncannily realistic.  Of course my REV MIT Cables from Joe Abrams are a huge part of it...2C3D technology is mind blowing if you want a huge realistic soundstage filled with detail and energy.

My current speakers are Sonus Faber Guarneri's driven by McIntosh MC601's.

Listening to that system late at night (relaxing) it sounds like you are right there with the artist.  Although I always wanted a little more bottom end and continued looking at other speakers.  Specifically the 802's or 800's.

When it would come time to pull the trigger, I would regress back to just really liking the sound of the SF's.  And when you factor in the esthetics, the SF's blow the B&W's away.  Of course, like the sound of the speaker, the looks are subjective.

I ended up adding a Rythmik G25HP sub and my search for speakers has ended.

Good luck whichever way you go, they are both fine choices.