I would just go with a 6600k, unless you plan on doing a ton of streaming, video editing, or 3D modeling. Also, it might be worth waiting a month or 2 since the 1070 and 1080 should both come down in price when there's more available. Also, make sure you don't get any with blower coolers, (this includes any of the founders edition ones)
Most exciting thing of the day: played against Amyrilla