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Im getting between 30-39k from a 580 which can be got pretty cheaply the GTX560ti's still get around 20kppd and use less power, after that Im not sure.
From googling the 570 fits in between the 560ti and the 580 personally I like the 580 for ££/ppd
The 6series cards run cooler but dont seem to do any better on points than the 5series not looked into the 680 or 690 due to the cost mind.
Finally the other thought Ive had recently is to get some motherboard with the most number of 16x slots possible, fill them with gpus and put the most basic CPU you can in there and fold only on the gpus a couple of those would work pretty well as the starts of a folding farm.
From googling the 570 fits in between the 560ti and the 580 personally I like the 580 for ££/ppd
The 6series cards run cooler but dont seem to do any better on points than the 5series not looked into the 680 or 690 due to the cost mind.
Finally the other thought Ive had recently is to get some motherboard with the most number of 16x slots possible, fill them with gpus and put the most basic CPU you can in there and fold only on the gpus a couple of those would work pretty well as the starts of a folding farm.