Right now is not a good time to purchase a GPU IMO. My advice to you is to try to find something on sale that suits your needs. I've been seeing the 1gb GTX 460s go for around $100 lately, and a pair of them in SLI would crush the 570 for less money. Even a single GTX 460 can handle just about any game out there at moderately high settings.
Thanks you guys for the explanations. That's another thing I was wondering about...if I should just wait. The 28nm GPUs are just a few months off, right? And I feel like there haven't been any advances in the GPU market for most of the last year in the price range.
Well...two questions. Is micro-stutter much of an issue with SLI set-ups anymore?
And two...the games I'm most interested in are Skyrim and BF3. Would two 460 GTXs be able to handle those at 1920x1200 at ultra settings?