I just went through this and you may opt to install a couple double wide boxes in the walls with conduit running to the main box. This allows you to snake anything you want later. A couple words of advice, make sure the conduit is big enough to allow the head of an HDMI cable to be run, you won't want to spend the money on a HDMI with a removable head. Also, if you can, put in boxes that have no backs, low voltage boxes, and worst case install deep electical boxes, otherwise your bend angle will be too steep when you go to terminate the cable.