To be honest you'd be a lot better off waiting for pascal, the 1070 would be your best bet in terms of price to performance. If the 1080 can push to 220fps and the 1070 has ~80% performance of the 1080 then yould be looking at about 100 fps per panel at 1080p at med to high settings.
If you got 3 60Hz panels then you'd probably be able to game at high to very high settings at ~60 fps on a 1070.