So I am not much further than you. I need to remember which card is my GTX 260. But I think your right its not much further off my 275's. I have 4 GTX 275's still and 2 GTX 260; so if I gain 1k ppd more on the 275's thats 4k more a day. When I had 10 275's it was more noticeable. every little bit adds up. main reason why I went with the 275's.
Either way i think now the 260's are probably the best bang for the buck right now.
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