Different display oddity on New iMac i5 27" : moire/pixel shading

Hello,
I just got my iMac Core i5 and I'm happy to say I have not had any of the many display problems that others seem to have.
However I have noticed a display oddity that's quite subtle but bugs my eye nonetheless:
It's easier to see in the grey of the window tops, the Safari window is a perfect candidate. You have to be staring at the screen pretty closely. You can only see it while moving your head, oddly enough, or moving the window. On my display it's most prominent at the top of the display and it fades out completely by the bottom. It looks like the grey goes pixelated in mini checkerboard pattern, almost a moire. It's not just the grey or the window, I believe it is visible in any medium dark solid color.
I've seen it on other, older, iMacs, and I had come to think of it a side effect of the cheap 6-bit TN panels they were using on the older iMacs but this panel is supposed to be a good IPS 8-bit. Also, I cannot see the effect on a 24" Core Duo 2 2.93Mhz. Could it a difference in video card, nVidia VS ATI perhaps ?
It's not terrible for normal use but it keeps catching my eye as I move my head to look away from the screen so it's becoming a bit annoying.
Anyone seeing what I'm seeing ?
Is the problem with my eyes ?
Can anyone shed any sort of technical explanation ?
Should this be considered a defect ?
Thanks

Indeed it's not. But I don't think it qualifies as something to worry about either. While I suspect others may be able to see what I'm seeing it doesn't seem to be something that gets noticed. Indeed I wouldn't be surprised if most wouldn't notice at all.
Don't let me spoil your expectations as one may be driven to look for minute imperfections once one knows where to find them. Those computers are nothing short of marvelous. I'm a pixel-peeping photographer and I had been looking forward to those LED lit displays for even and consistent colors. They deliver a great image, I might simply be starring to closely at it.
I'm not about to send mine back with this a defect I was mostly curious as to how noticed of an effect it is, if it is apparent to most people and what it could be caused by.

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