Garsh-dang it! With my son off to college, the Sammy 55" in the family room is mine! So, I'm playing around with the new Hooper 3 firmware that downloaded earlier in the week and I notice a line going through some of the Hopper's GUI. Long story short, this line is on all inputs, and the Sammy has a self-diagnostics section of the TV's menu which proves the problem is with the Sammy, not the Hopper. So this theoretical "What Should I Buy" moves from wishful thinking to "Dang it, I wanted to wait for OLEDs to drop further in Price".
The best I can tell, this line is 1/8 of the screen from the bottom, and seems to repeat the row of pixels 4-8 pixels above it. Vertical patterns are not a problem, but this is right about the sweet spot for lower-thirds and it smears part of the text. And it's one of those things that once I have seen it, I can't un-see it.
Research time!