The only real question in my mind would be if there's a chance of a monitor upgrade in your future? The 670 review is comparing a stock OC'd 670 to a vanilla 680, and if you then compare the vanilla 680 with an OC'd 680 version at higher res you'll see that there is a fair difference at the stock OC.
All that remains to answer would be much overhead is still available for OC between the respective stock OC'd cards.
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