I received my 60 A2000 last week, and have spent a few days tweaking and evaluating it. It's hard (without a test disc) to settle on the "optimum" settings until you've had a variety of content and several hours with it.
Overall, I'm blown away by the HD quality on high quality feeds (Discovery HD, Conan OTA, HDNet). On SD, I am dissapointed but find the high NR setting helps a TON. I also have a 42" Panny Plasma and a low end 4:3 LCD projector, plus the 36" WEGA this is replacing, so I have seen the gamut of technologies. Oddly, the 4:3 LCD projector shows less noise on SD than the SXRD, probably because the low resolution just hazes out the details, even on a 92" screen.
I used the settings many have suggested here for a while, and was mainly dissapointed with the black levels, which never seemed to be truly "inky" as is always stated. This is replacing a 36" WEGA so of course it's a hard standard to meet. Yesterday I switched to low power mode (which seemed to take out the "pop" when tested previously) and I REALLY am enjoying the improvement in practice. If you aren't running in power save, give it another look.
The other which is hard to settle on is Noise Reduction, which I find DOES help SOME HD content when set to medium or high, but ALSO takes away something of the WOW factor. I have settled on LOW for now, but will manually set to HIGH if watching SD for a while that is really noisy.
Here are my settings:
Auto1 (tried at auto2 but I have settled on auto1)
Picture 65 (have tweaked it several times)
Brightness 50 (a few notches below the 54 I had made a big difference)
Color Temp Cool
Sharpness 80 (had at 20-25 but am enjoying the 80 for now)
advanced -- all set to off (had played with black corrector, but now it's off)
r gain -7
g gain -7
everthing else 0
I have no way to calibrate grey scale per se, so I am just going with the more moderate suggestions here.
On the stand, I have a 15.8" high stand and found it is a GREAT height. I would not want the TV much higher.
Kudos to this forum and the many positive contributors who helped me with the decision to buy and the tweaks.