Synergy is everything. I have had one pair of Dynaudios, the 70 series. Admittedly not their top of the line, but I believe they are consistent with their sound and philosophy. Watts is not the issue. The answer to your question lies in what you like as a reproduction of live music- do you hear more life-like sound out of the Dynaudios, or the B&Ws? Only you can decide.
Dynaudio or B&W
I have a pair of B&W 703s and am thinking about going to a pair of Dynaudios. I purchased a pair of Focus 140s for my other system and just love them. I have been tossing around the idea of the 220s or the X36s. I may go Contour as well but the hang-up is cash. It could happen though. I am using a Jolida JD-1000RC which is plenty for the 703s and I would suspect plenty for the Dyns as well. I listen to everything from classical to metal. Any opinions welcome.
Thanks.