Late to the party, but I'd have to agree with the 570 recommendation, mostly because I picked up a used 570 for $150 shipped to use for folding, and I can get up to 29k ppd depending on the WU. As other's mentioned though, my computer is quite sluggish for doing simple things like surfing while folding is active. I can play Borderlands 2 when folding, but I usually pause it since it absolutely kills my ppd.
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Folding with rig under My System Specs, GTX460 in the kids' computer and whatever my dad can contribute.
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