If I were to upgrade I would go for it. The 690 is just amazing but the price tag on it is huge. I would have went with the 670 as well.
My 570 is perfect though so I highly doubt I will be replacing it. Do you have a steam account?
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The 2014 Hit Squad (FFL)
Eddie Alvarez - Junior Dos Santos - Patricio Freire - Jessica Eye - Pat Curran