I've got the same TV and would like to know the same thing. I'm happy with the settings I've got for the various settings. I've got the brightness and contrast set in the right ball park using the THX calibration tool I had on a couple of DVD's. I've changed the colour levels as well, but based solely on some settings I've seen on the net which isn't the best way of doing things.
I'm not sure whether it's worth doing a full blown calibration personally as my set is in bright light during the day, but we watch movies in the dark, so if we set it up for one, it messes up the other. At the minute I'm using the true cinema setting for my blu ray player, and just cinema mode for everything else, then I might calibrate each of these modes separately to solve the daylight/night time issue.