The 1070 rips at 1080p - it's overkill for just 1080p gaming.
It's a very good 4K card as well, depending on the specifics of the game.
If I had to pick, I'd say it's the dream 1440p gaming card.
(Former 1070 owner here)
I actually sold my 1070 as a 6GB 1060 is much more suited to my 1080p gaming and I didn't want to have money on the table for tech I really wasn't using.
You were really plugging the GTX 1080 a year ago, big time. Glad you learned that the 970, 980 and 1060 are best suited for standard gaming monitors. Saved yourself some money, good for you. Kind of an extended learning curve though, but that's what it takes sometimes to find the right answers.