3937edwards,
There isn't a 'best' setting for any TV. What you can ensure is that your TV is calibrated in a way that will optimise it's performance in your own living room - the settings for each room will vary according to lighting conditions etc.
You could use the THX Optimiser to do this or if you want something that is more detailed, try the Spears & Munsil Calibration Disc.
Ronald