I have the B&W 683s.
I compared them to:
Martin Logan Motion 10/12 (toyed w/ the unpowered electrostat, but the pinpoint positioning needed to actually hear the music well killed that idea quickly)
JBL - don't recall the model
Energy (6 1/2" 3 way, don't know model)
Def Tech Mythos (was a floor stander, don't know model)
Polk's Quad 6 1/2"
Mirage - OS³
and one or 2 others I can't recall.
I took my own music in and listened to tracks I know very well, per all the advice I had read. I even took my own Blu Ray in for the HT test.
Over all, I loved the 683s above all the others. I had a budget of $1500 for the fronts and this was as high as I could go, which is why you'll notice most of what I auditioned falls in that price range.
What I noticed is you seem to be on the right track. If you can't properly audition a speaker, don't buy it. The problem you'll have is you'll always wonder if you made the right choice. If you buy a set cheap, then maybe it won't sting as much when you realize you aren't happy with what you've gotten, OR you'll absolutely love what you have and not worry about what could have been. For me I would have fallen into the former, which is why I tried so many. For me, the 683s were, without a doubt, the best speakers for my ears and in my price range.