I've had a very good experience with a 1080, and I'm told a 1070 will do just fine. Alternatively wait for Vega, and maybe save some pennies. Your 970s are still a good solution.
Don't concern yourself to much with ultra settings. Some of it exists purely to encourage you to upgrade (I'm looking at you, Gameworks!).
Don't concern yourself to much with ultra settings. Some of it exists purely to encourage you to upgrade (I'm looking at you, Gameworks!).