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Well they are all nice cards. Is there some reason that you want the non Ti modles? If it was my choice I would pick the one with two fans for more cooling. But you can always OC the card.
I will show you a few benchs marks not the OC'd one but you can figure it will be a 20 to 30 % increase in the preformance. I hope this helps and good luck to you.
560 non Ti vs 6870 as you can see the two cards are close with the 6870 a bit better.
560 non Ti vs 560 Ti
6870 vs 560 Ti As you can see they are close but the 560 Ti is a bit better.
This is the card I would recommend over all the cards listed above if you can afford it.