I'd rather be proud of spending my money wisely then announcing the world over that I parted with it gladly.
Well, in the future, 2 or 3 680s should outperform 670s (we still do tri-sli right? oh and I say should instead of will because loldrivers). Thing is, considering the price of cards nowadays, and assuming the trend will continue, its probably more worth it to just get a newer card at that point. So is it really worth it? No. I don't think top of the line cards have been truly worth it since the 8800.
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...you're aware that there's an invention called television, and on that invention they show shows, right?
-Pulp Fiction