I have a few questions. 1. Is it important that the center speaker be the same brand as your front speakers? I read somewhere that as a rule of thumb it is a good idea to do that, but is there really a difference? Or should I just go with another quality center speaker. 2. Are there any CD's out there to specifically test the capabilities of your audio system? If not could you recommend some good albums/songs to do this. 3. If anyone could please recommend some good receivers, TV's, and cd players that would be great. Thx.