actually, I'm going to sell my PC next year so I'll go with the 5670 because the 6000's are coming soon and people here in Mexico always go for the newest, even if something older is better. I mean it could make like a 1000 pesos difference when I sell it. Thanks anyway. And a lil' something else: when the 28nm gpu's come out, will the high end cards still need a power plug?
Of course, maybe even dual 8-pins, they will increase the performance as a priority over power usage for the most part.