I may get flamed for this but... I personally feel that for Vocal and Classical, the B & W's are really hard to beat.
Though, if you listen to any other genre you may get more mileage from the Dyns. I loved the S5.4 and if I could afford it, it could very well be in my audio room now. IMO, these two brands have a very similar sound signature.
As far as synergy with your Amp and Pre, which I think are top notch BTW, I would characterize this as right down the middle. Dyn's and B & Ws are neutral to revealing, the Pass amp is neutral, the Pass Pre is neutral as well. You may want to inject a bit of warmth (tubes?) at the source end. To mix things up a bit how about a SS DAC and a tube CDP (or vice versa).
Thats about the same setup I have, albeit with better speakers, amp, and pre. Some CDs clearly sound better through the SS DAC, while others (most) are better through the tubed CDP. The diversity is great and a real asset to listenability. I will never again limit myself to only one digital playback system. Though you may prefer analog, which is great as well.