i've had the same set for a couple of weeks now. These are the settings i've settled on
Contrast 64
Brightness 50
Colour 32
Tint 0
Sharpness 0
Scan mode ‘natural’
DNR ‘auto’
Black stretch ‘off’
Colour temp ‘cool’
To be honest i think all those settings are down to personal choice. I chose them for viewing through RGB on skydigital (inc BBC1, ITV etc), with skybox set to 'low' contrast. These picture settings also suit my DVD player (again through RGB).
I wont spout the "proud owner" waffle

, but just to say that i'm totally happy with the set.
Dean