Here's the way I look at it...cards will always drop in price, and something new will always come out. If you can get a good deal, on a good card, do it. Otherwise, why not wait for the 980Ti to drop in price...or the card after that?
Just saying, don't always wait for a card to drop in price because when it does, a new card just released with even more power. Guess what, it will happen to the GTX 980Ti this winter as well I bet. Christmas rolls around and a new card comes out, why not wait until then? Or after that wait until Q2 of 2016?