In my ever long conquest to **** my wife off, I am again looking at an upgrade. this time in the form of KEF TDM 34DS THX Surround Speakers. The problem is 2 of these wouldn't match my Mission M7D's I would like to keep as my back surrounds. Shock horror, they look really different!! (says the missus) These Kefs are obviously quality speakers and I am contemplating for now trying pursuasion on the lines of, lets go to quality 5.1 with the Kefs, or stay 7.1 with the average Missions. What to do???