i'm leaning towards cable issues too.
new tech (hdtv) + old tech (inferior cables) = bad.
the only way to really tell though is with the new box. those screen caps do show a abnorbally crappy picture though.
We'll see tomorrow when we switch to SVideo for the dvd and HDMI for the Dtv box. The picture at the store where we ran our DVD test looked nothing like the ones we have at home.