I'm pleased you are so happy with the set. When we were in our local store today testing out the HU8500, the samsung rep let me do a white to black greyscale uniformity test, and there was no banding at all. It's the first led set ive seen that has passed this test! The 58inch panny that I bought initially had vertical banding and the replacement, the 55 inch 902b which I'm currently looking at, has horizontal banding (just like Venetian blinds) Its an amazing coincidence that you've had, and rejected the exact same sets for pretty much the same reason. So you can understand, more than anyone, why I'm being cautious about committing to yet another led set.
I'm glad you haven't noticed any motion/judder problems as reported on avforums owners thread. Maybe the software updates has eradicated this now.
I'm even considering the 65inch now, as I can get it for 3k - take advantage of the curve!