Well if you take the plunge you can sell me one of your old 1070s I am trying to wait for 1070ti to go back to reasonable price along with ram though. It will happen someday I hope.My local Microcenter has the Asus STRIX 64 at $1029 USD, but they supposedly offer a discount on that if you're doing a build.
I've been toying with the idea of doing a new build, but the 1080Ti would be my poison since I'm currently gaming with 2x1070s.