I have had great success with HDMI over cat 6. I have a similar situation to you in that my tv is over my fireplace. I ran three cat 6 cables down to the basement through the chase for the fireplace. This was very easy. I ran one cable for future use, and two for the HDMI. The HDMI uses one cat 6 cable for transmit and one for receive. The HDMI over cat 6 comes with two faceplates, one you mount behind your tv and one behind the components. I then got a nice harmony 900 rf remote and all works great.