I had a similar discussion with ST the other day WRT my purchase of the 680. It's overkill for a single 1920X1200 monitor, but as with my PSUs I like a bit of overhead and I sleep soundly knowing that my vid card will be able to handle anything I throw at it for the foreseeable future.
The question then is whether or not futureproofing / overhead is worth $50 - $100 to you.
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