I know that, I posted the benchmark images here.
My point is that you have gone from trying to persuade us that the 1GB model is worth $50 more, to trying to prove that it's better in the higher resolution test. Lets not forget however that the 512MB version performed better then the 1GB version is every test done at the more common 1280x1024 resolutions, and when comparing the cards at their stock speeds, the performance difference at 1600x1200 is anywhere from only 0.5FPS - 3FPS.
Now you tell me, is it worth $50 more to gain an extra 0.5FPS - 3FPS in high resolution games, and lose performance in lower resolution games?
I am not trying to convince you that the 512MB version performs better (since overall the 1GB version is better), however as I've said before, when you weigh out the pros and cons of each card, you will realize that having 1GB of memory on a card such as the 8800GT just isn't worth the extra cost.