I have this exact same TV, only the 57" variety: 57731. I just purchased it a few weeks ago as well. And YES, I am envious of your extra 8 inches.
As Richard said:
(all accessed through the video menu)
1. Set Video Noise to "Off"
2. Set Picture Mode to "Natural"
3. Set Color Temp to "Low"
Also, make sure your HD box (mine is the HR20 DirecTV DVR) is set to the following. the setup can be accessed by pressing "Menu" then choosing "Settings" - "Display"
Native: On
Screen Format: Pillar Box (so it doesn't stretch 4:3 content
then on "Settings" - "TV Type":
TV Ratio: Widescreen 16:9
TV Resolutions: (select all: 480i, 480p, 720p, 1080i)
Note that if you have a different DirecTV receiver, your settings may vary.
Also note that if you are viewing your locals delivered via satellite ... these are almost ALWAYS crappy. I choose to pick mine up via antenna.
If you want to make further adjustments to your picture, pick up a copy of DVE (Digital Video Essentials). The HD version is available right here in our store:
http://www.hdtvmagazine.com/hdstore/pro ... ctid=16708
Cheers,
- Shane