Speakers are a very personal preference item. If you can listen to them, then that would best, but sometimes you can't. All of these options are excellent, but in different ways.
Wilson Sasha Daw - Wilson are very high resolution and revealing speakers (usually using the scanspeak type drivers). At first they can sound very realistic and you hear every detail, but they require careful matching with electronics because they can sometimes sound too bright and harsh. It is likely to be just fine with the McIntosh. Choose these if you want the highest resolution speaker.
B&W 800 D3 - Since I own the D3 series, I am partial to these. They are very neutral and accurate speakers. Though, it appears not everyone likes them for some reason. The tweeter is the most accurate and clean that I have heard. This could be the problem because it can reveal flaws in other sections of your system. But they are very realistic and natural sounding speakers to me. I have seen the D3 matched with McIntosh a lot at shows.
Rockport Atira II - these are interesting speakers. I have heard them, but they are not my preference. They are not the highest resolution speakers. Best I can describe is that they sound slightly creamy and colored, like some of the high-bias Class A amps like the new Krell, Levinson, etc. They are not very "revealing" or realistic. It really depends on your personal taste here. These may not be the best match to McIntosh which is very laid back.
Dali Epicon 8 - these are high resolution and revealing speakers like the Wilson. The ribbon tweeters can be bright, but with MCIntosh, they should be fine. They are not as good as Wilson.
Sous Faber Tradition Amati - Sonus Faber are very excellent sounding speakers. Very natural. Not as high resolution as B&W or Wilson, but I have loved every one I heard. I did hear Sonus Faber bookshelves with McIntosh integrated. You could tell that it was very special and sounded excellent, but it was still too laid back for my personal tastes. You might like it very much.
If it were my choice, I would probably go with the Wilson because the McIntosh are so laid back in the midrange/highs. The Wilson's would sound so clean and crisp with the McIntosh, I think it would really shine! The Dali are okay, but they are just not as good as the Wilson and you wouldn't get all the resolution and tones that the Wilson would provide.
My second choice would be B&W 800 D3. The B&W might sound more "analog" with the McIntosh, but it could also be a little lush and messy, depending on what wiring you use, etc. For example, if you use all silver wiring and terminations, it's not going to sound analog and could sound bright and artificial.
Third choice would be Sonus Faber in your list. The Sonus Faber might give you the most emotional engagement and impact, but it is still too laid back for my tastes (I want attack and excitement!).
My suggestions are all based on your McIntosh electronics. I have heard Sonus Faber on a older Krell 403e and it was absolutely amazing! However, I would never match Wilson to this Krell 403e amp because it would just be too bright/harsh (like someone turned up the "sharpness" on the sound wayyy too much).
