About the Seiki... you need to boost the signal on ( what seems like ) the majority of the panels.. We purchased many of them, and there is only 2 that don't flicker at all, and another that flickers once every hour or so...the rest of the displays go in and out till it drives you crazy. It just seems like its hit or miss if you get one that doesn't quite hit the HDMI spec, because the same thing happens if your hooked up to REDRAY, or a computer, or a AV receiver etc. I hear there is another firmware update coming soon... not sure if they can fix that.
We are using these as our desktop monitors in the office hooked up to our computers, and as I mentioned we get the same drift in and out issues. There is a solution for that panel.. Gefen makes a stabilizer that fixes it almost instantly for whatever device you hook up to... but its not a cheap solution.