I have a 60" diplay. I prefer a stronger center channel presence than most in HT-mode and like the idea of placing a center channel speaker above and below the display (balanced to middle of display).
My LCD is located 13 feet away from listening sofa and center channel speaker is located about 3ft below the display (bound by cabinet configuration). I "believe" the addition of another center channel speaker would help balance the sound (coming from display and not 3 feet below) and provide a little extra punch from the center channel... just don't know how to wire to a 7-channel amp to eight speakers. A $350 speaker is a possibility for a father's day present