Rear B&W addition

[crytklmass]

As you can see from my description I have B&W 802D, HTM2D, and SCMS1 for rears. While I would like to add another set of SCM or 805's for rears. (each costing $2400.00).
A friend is selling his:B&W DIPOLE/MONOPOLE SURROUND SPEAKERS DS6 S3
Would these make a good addition for rears or sides for surround sound. Preferably 7.1? He's only asking $250.00 much cheaper than the others. I guess im hoping there a good match. Most sound is from the fronts, only some sound comes from the rears. Guess im trying to justify this purchase in my head.
I know the 805 would be a better match but considering paying $2000+ is it really worth it? Am I going to notice that big of a difference for surround sound.

[KahunaCanuck]

For 7.1 I think the DS6s will do the trick...while I love 805s, for that deal why not try them?