Finally got my 60A3000 all set up with my SciAtl DVR cable box (Optimum/Cablevision), 360 and LG upscaling DVD player. Figure I'd chime in with some details on the more notorious settings. =)
With the cable box's HD content, depending on the channel and the movie itself, it can come through soft or with some blurred detail. So for the box, I have Cinemotion at Auto1, Motion Enhancer at Standard, Detail and Edge enhancer on Low. This provides a pretty decent image in my case.
For the LG upscaling player (set to output 420i), I used a Superbit Fifth Element DVD and Chronicles of Riddick DVD for playing around with the Video Options settings. I find both these movies provide great scenes for checking out black levels, sharpness, contrast, etc.
At the moment I'm not in front of my TV, but if I recall, I have Motion Enhancer off, Cinemotion on Auto 1 and Motion Naturalizer on Auto 2 (well, the one for "brightly lit environents"). With these two DVDs, I was bouncing back and forth with the set's Theater Mode. When this mode was turned on, the picture was surprisingly good! I did not notice any flicker during any scenes including fast motion - Theater Mode turns Motion Naturalizer on Auto 1 (the one for dim environments) which darkens the overall picture.
What I want to play around with more, is Motion Naturalizer's settings. I need to check it out with both my "movie night" lights as well as in total darkness, but I have the feeling I'll be mimicking the Theater Mode setting - having it on Auto 1 (dim enviroments) as I cannot discern any flickering, and to my eyes it replicates a movie theater projector very well (I'm a total movie junkie). =)
Anyway, I read a few pages back that there was some discussion about whether or not the 120Hz of the TV is turned on or off with some Video Option settings (that is, it can switch between 60Hz and 120Hz). If I had caught that conversation in time, I would have piped in with: "Although this is common knowledge with computer displays, I did a quick bit of research to double check, and as far as I can tell there's no liquid crystal display technology (regardless of target market/industry/end use), that can switch its refresh rate. Ergo, the set is always going at 120Hz."
Anyway, thanks to everyone that has posted their experiences with their settings!