After spending £2500 on new fronts and sub I am re-assessing my surround speakers. At present I am using 4 Mission M7D's. I have been fancying M&K's K4 Tripoles, but I have now possibly got an opportunity to purchase a pair of B&W DS6 THX certified dipoles for around £200. I would be using the new tripoles or dipoles on the L&R surrounds and keeping a pair of my M7D bipoles for by back surrounds. Any thoughts would be appreciated guys. Cheers.