it is huge anoth for me to pay extra for the 570.
here is a great test of the 560. (the link below)
in this test you will also see the GTX 570 followed by the 6950 and the 6970...... and some other cards.
this test is very god.
the reason i like nvidia best is that most games that are optimized are optimized for nvidia. like grid 2.
you will ses that in the test that the gtx 560 beets the 6970 in grid 2.
but the 69xx realy has an avantage in memory size.
here is the link:
Nvidia GeForce GTX 560 Ti Review - TechSpot