Just installing a new Panasonic 50" with a set of KEF 3500SE speakers. The wall is going to be clear of everything bar the TV and front speaker system, and we will be sitting approx 5 mtr back. Cieling height is 2.4mtr. What height do you think is corrcet for TV installation : centre of wall, or mid screen equal to eye level ?( i.e lower than centre of wall.... and where should the speakers be, we can mount up to 900mm either side of screen but I am wondering if centre speaker should be above or below the screen, angled up/down as required. any clues?