For the past three years, I too have been waiting for the used market on these speakers to hit the $10K mark. A the beginnign of my search i auditioned all three and concluded the following:
1. the 800s only sound good when they are played loudly, and as the frequencies move from drive to driver, you hear a change in elevation of the sound source. To demonstrate this clearly, listen to a drum solo with a decending tom tom pattern.
2. The Wilsons are SMALL in comparison and fit well into the living space without taking it over. They are punchy, and good for rock, although they do not disappear in the room, and their sound stage is limited to a region between the speakers.
3. The Utopias, which are large and need space to breath, needs the least amount of amplification, and sounds better than the others at low volume levels. Also, hey cast a huge soundstage, and when properly set up when listening to jazz with my eyes closed I swore I was at a live performance.
My choice is #3 if you have a large room (mine is 18X25). I am still waiting for these to break $10K, which I assume will happen when the Nova utopias come out this year.