I did the same mental battle a few days ago. Ultimately decided on the 8800GTS (G92). It rocks To many times I've short changed myself by a couple dollars and find that I end up having to upgrade the video card earlier than I could have.
Get the 8800GTS, you might grumble for a day or 2 over the extra $30, but you won't be grumbling for the next weeks/months/year about the extra performance.
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