Thank you so much for responding. I did try turning off the 120hz but I don't notice the difference. Also i'm trying to understand the "soap opera" effect. Is that just about seeing judders or what I described like the images in the foreground look superimposed over the background? Or like actors walking around on a set?
Also here's my full hookup info:
HD Cable Box - Samsung
Cable Company - Time Warner Cable - New York City (cable box is set to 1080i, 16:9)
HDMI Cables - i'm using the ones that came with my HD Cable Box from Time Warner (they are 1.3)