I expect most people, myself included can't afford to upgrade all channels at once so what is the best way to go about it? One thing that may be a problem is manufacturers dont make their products forever, im not sure how long the average life cycle of a speakers is or if its really a problem. I have all series 2 B&W's, for example would a series 3 speakers blend in well tonally with the older s2's? What do people mean when they talk about a tonal match, do they mean similar frequency responses? what is the actual differences between two tonally different speakers, physically speaking?