I'm currently using a Marantz SR7013 with 5.1.4 with 2 HSU subs and 1 RSL 12 sub. All my speakres are Bowers and Wilkins except for my surrounds which are old BOSE 601's that I've had for years. I'm wanting to upgrade my surrounds and use B&W. I've looked at matching 603 S2 floor standing, 606 S2 and 707 S2 bookshelf speakers. I'm thinking the asthetics of the book shelf on speaker stands would look good. I also think the 707 S2 would have mopre clarity but then again they are only surrounds but might sound good in all channel stereo. Looking for recommendations on what I should consider purchasing.