I have 2007 after updating 2004 ( I think) for sound dropouts. My pic had wow factor with 2004 and still has it after update to 2007 and the sound problem is fixed. Watching NBA on TNT right now and its unbelievable. My build date is Aug 08, do not know panel letter,(do not care) 0 clouding, 0 flashlights and 0 dead pixels. TV is on from 8 AM to 11 PM 6 days a week (I'm retired).
I love my 52A650 in living room and also my 32A450 in bedroom.