Brian is totally spot on. This series of speaker had excellent cabinet quality. They are almost of the quality of the Nautilus 800 line and the mentioned possible $100 offer is not going to work. As Brian indicates, there really isn't a similar line offered by B&W. The current CM9 is close and not cheap. The CM8 fails to play as low.
Brian's price range is good as well. This previous series holds its value fairly well due to really having great quality cabinets and 800 series drivers. they are older, but so are my 805N's and they still sound great.
Finally, consider these older speakers, that have furniture grade cabinets and quality drivers, depreciate much like a quality piano. Quick depreciation at first but then flattening out at 30 to 45% of original MSRP. You will not see this same depreciation curve on Polk. Go look at the auction sites for resales on this stuff. Now if the cabinets are trashed and the speakers are blown, they are worth next to nothing; much like a destroyed Steinway - part value only.
Those speakers are newer (10-13 yrs) and much higher up in the line. Comparable models today are $2k+ in the B&W line. The last time I posted used pricing my post was removed, but the bluebook on the used speakers is ~$580-715. If they are in particularly good shape then that makes them worth more to me.
Only you can decide value.
great advice, i'll bite the bullet. The thing which bother me earlier is if older speakers sounds as good or better than current generations. This just show speaker technology has not drastically improved SQ over the past 10 years or so. I might be still wrong though.