I was just going to say - how were the speakers set up in your comparison? Was the ratio of the distance between the speakers to the listener close to .73 as specified by the Ascend manual? How far were they from the rear and side walls? How close were obstructions to the front face of the speaker? Did you level match each set of speakers with an SPL meter prior to listening?
Also, I listened to the B&W 603's looking for speakers and I found my CBM-170s to be AT LEAST as good, if not better. But, that was not a direct comparision and it was awhile ago. I just know I didn't buy the B&W's
As for cables, I think that if any cable is changing the sound it is doing something wrong. A good cable is transparent, and does not distort or alter the signal going to the speaker in any way. Frankly, based upon my reading and how well I think my plain old SoundKing 12ga w/bannanas does, I would encourage you to do some double blind testing with "expensive" cables and some "regular" but quality ones from companies like: www.bluejeanscable.com
Again regarding cables, it is my opinion that science is very important. This site has a lot of reading that tends to agree with my thinking on the subject. I'm not aggressively challenging your opinion, but I want to offer another viewpoint to you other than what you are getting from the salesman at the B&M store:
http://www.audioholics.com/techtips/...les/cables.htm
Note, I can't say I've read everything listed there, but the genreal idea I agree with.
Anyhow, keep talking with the great guys here and with DaveF (who is also a great guy ) and I'm sure you will find a great deal of untapped potential in your CBM-170s.