Joe,
I still vote for Ascends. I'm pretty familiar with B&Ws, the 600s, 700s, 800s. Even the 170 SE, IMO, is more clear than the 700 series from the mids on up, better soundstage and imaging too IMO, and for only $350. Granted, I heard them in different rooms. The lengthiest audition I gave 700s was with Rotel electronics, and the dealer left me alone to swap out speakers for myself. Also auditioned Quad at the time. I was using a 6 cd auditioning array.
Regarding 170's, its the bass articulation that left me wanting, but in context of what you are getting for the money . . .
This is why I often say that I would love to hear the Sierra's.