I just upgraded from a GTX260 to a GTX570.
I wanted it primarily for folding and the 570 gets double the points of the 260 - but I'm getting NAN errors so the PPD is about 10k until I RMA (I will RMA when NCIX folding contest is over)
I also got a smokin' deal on my 570 = $250 total (free shipping to my brother in USA, zero tax and I also used EVGA folding bucks)
My old GTX260 was a great/fantastic/awesome card and I would not have upgraded other than the desire to increase folding output.
So I guess Im saying IMO you should stick with the 280 unless there is something specific that you want some extra GPU power for.
__________________ "Try looking into that place where you dare not look! You'll find me there, staring out at you!" - Frank Herbert
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