I need to upgrade my bookshelf speakers to finish my audio upgrade I started a while ago. For my 7.1 system I started with upgrading the center channel speaker to B&W 700 series. The ceiling now has 4 B&W CI300 speakers. I initially planned to upgrade the bookshelf speakers to B&W as well, but I have been impressed by the reviews on the Elac bookshelf speakers. I would probably go with the Unifi 2.0 speakers just released. The speakers would go in cabinets, so the front subwoofer is attractive. The price difference between the two manufactures is substantial, so I would like to feel the additional cost of the B&Ws would be a good investment. We watch about 99% TV and movies. How important is it to stay with the same manufacture for the center and bookshelf speakers?