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#11
I've no personal experience with any of these. Benchmarks at www.anandtech.com make the 560ti the weakest of the lot, with the 560ti 448 core and the 570 pretty nearly equal to each other. (I'm not sure how much you gain with the 2GB 560ti. VRAM is nice, but I'm not sure how helpful it is at a mere 1920X1080.)
The Radeon 7850 looks like it's in the same class at the 570. However, the 7850 is newer technology. I usually prefer nVidia's drivers, but the 7850 is a worthy competitor. In the US, it's cheaper than the other options that you mention. If the same holds where you are. it'd be worth a close look.