thanks for the detailed response.
I have another question -- what is the advantage of going with a pre amp/amp and then a wireless device (a total of $1000) over a single AV receiver (the latter option would leave more in my pocket for the speakers)
I'd originally neglected the whole pre-amp/amp thing but that was largely out of ignorance -- I've yet to grasp the role of these components. But this approach does suit me in a way because it means I can choose whichever wireless device works best with my operating system (e.g. I could pick something besides the Sonos and still have a top notch amp/pre amp) without boxing myself in to something that might not have the best audio quality.
I can only tell you what I would do and I like having separates, plus I can hear the difference between the stand alone dac and the built in units I have heard in avr's. With music only systems I wan't it to be just that, so why clutter up the function with all the video crap, I can definitely hear the difference between my music system and my HT system which are both pretty close the main difference being the avr vs the stand alone dac....
Heres how I figure in a music only system, I want to start with rock solid electronics since them are probably not going to get upgraded, then pick and try speakers at will, don't get too hung up on cost of speakers, I have heard $200 speakers that I enjoy over $2000 speakers, and with what you need its even more important because you are not using a sub, so if you get a plain set of towers that have dual 7" drivers you may not be happy with the bass output.... Them martins I linked you to surprised me with the low end they reproduce {this is impressive because I am a 2.2 guy, and for 2.0 I like very few speakers}...
My 2.0 system uses Tekton Lores, its in the bedroom and I wanted a tube amplifier for ambiance reasons, and since tube amps are generally low power the tektons are very efficient without using horns {Im not a fan of horn loaded speakers}. But I don't usually recomend the lores even though they are amazing and everyone that hears them loves them, if you don't have a pair near you, its hard to demo them, and speaekrs should be listened to...
With the martins you can just return them, no harm done... I wish the evo2 40's were still on sale for $799 because I have a set of them , and they are amazing, but even at that I like them much better with subs... But like I said, this is my taste, you may pick up a speaker with dual 5" drivers and love the bass them make???? I like fast deep strong clear bass, that solid sound. That I have yet to find in a tower speaker... The Opus 2-3's and cv 215's have some decent bass, but neither fit you... the opus are expensive and the cv's are ugly...
What have you listened to? I had people telling me to check out b&w and klipsch when I first started looking and I hated both, the b&w's I liked were out of my price range and from the Klipsch I listened to , I don't know how they are in business... But someone has to like them...