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in a perfect world for gaming, i'd get the 6600K. overclocking on the newer intel chips is so easy, and they do so extremely well.
i would have needed a mobo upgrade as well, so went with the 4690k and am more than happy.
look at the used market, you can get some really nice deals on cpus...
Congrats on being able to borrow a buddy's card. That's the way to go imo. I'm always a bit hesitant with SLI, when it works its nice, but it can be quite the hassle as well. I personally prefer a single card, but if it works for you and the games you play, but all means go with the second 1070.
1080 would be a big improvement, but if you're already getting good frames, then save the money for now and go with a larger upgrade in the future imo. its tough when you get that upgrade itch, so if you have to scratch it might as well go big.