Well, I finally did the change. Today I paid the difference for my replacement. I will return my Samsung PN59D8000 (Y504, but it was a Buzzer), and bought the Panasonic 65" VT30 instead. I really like the Samsung picture, very clear and with great colors, but the build quality, flimsy stand, and buzzing issues (my second Samsung TV that buzzes excessively), etc, made me do the switch. Additionally the store could only offer the I503 build for the 64" which is an older version than my July build Y504.
I also off course wanted the larger screen size, so it was either Sammy's 64 or this VT30 65 inch set. In the end, my wife also liked the Pannasonic better than the Samsung, which partly played a role i the decision in the VT30s favor.
I am a little antsy still since the Panasonic image did, in the store, not seem as sharp and well defined as the Samsung D8000 image, but it is so hard to tell in a store where they run a tv signal that is shared by so many other television sets, and have a lot of ambient light sources to make the plasmas look less than optimal.
It did however appear to be much stronger and well built than the Samsung, which in comparison felt a bit flimsy to me at this point.
I still have to see how the TV image looks at home, but I assume there are some settings I can manipulate to get a big more defined image should it be lacking (sorry I am a Noob, can you tell?
I guess I will do the slides like many suggests to also check the set for faults.
By the way, can anyone recommend a good calibrator for this set in the Los Angeles area?