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I spunked £1k on a pair of 780Tis just over a year ago, but I've voted a definite no for this.
Might start getting interested when 980Ti comes out, but still probably not. There's just not the exciting leap there used to be.
Maybe depends if price drops to reasonable price point for me before newer stuff comes along.
If a good deal comes along then fine if not, happy to wait for 980 Ti / 390X..