I would not mix the silver and bronze series across the front. Either go with the silver center or the bronze b2 for your fronts. As to receivers the Marantz is a much better match with MA than Denon. I have heard both several times this year and the Denon is to thin compared to the Denon when paired with MA. You didn't mention models but try the Marantz 5400 and up you'll find they sound great together.
I like the Marantz much better with MA's whether on movies or music. Just a smoother,richer combination to me but you'll have to deside for yourself. I have two local dealers who sell Denon and MA and I just don't understand why they do. To me it's just not as good as MA with Marantz, Elite, H/K or NAD. Only your ears can tell you what you think. I think you are on the right track with the 5400.