Here's what Tom's hardware concluded after testing the GTX560.
Now, in the face of GeForce GTX 560 Ti, AMD says the Radeon HD 6950 1 GB will be priced at $259 and the Radeon HD 6870s are down to $219 (without the need for rebates, which we confirmed before this story went live). Whether or not those prices remain remains to be seen. Either way, my conclusion on the GTX 560 Ti doesn't change. It still doesn't present me with the overwhelming urge to upgrade. AMD's cards simply look better in comparison, based on their performance.
I checked newegg and the 6950 is indeed down to $259. Considering you can unlock it to a 6970, really makes the 6950 the sweet spot for fps per dollar.