1) Cat6 ethernet cable to be sure your network will cope with Gbps (1,000 mbps) throughput in the future, especially considering full HighDef signals.
Very, very small price increase, especially via online sources.
2) If your TV has HDMI-DVI connectivity it can be driven directly from a computer's video-card digital output, e.g. your laptop plugged into a PC Ethernet network socket in the dining room.
Or from an XBox 360 connected to your PC network and driven from a computer running Windows Media Centre 2005 (has an XP Pro kernel).