Make sure you do the diligence and register for EVGA's Step Up program. If something happens (sudden windfall, SQ42 has a huge spike in system requirements, etc) and you want/need a different GPU, you can send EVGA your card within 90 days and they'll apply its full Purchased Value (eg the $ value on the receipt you send with it) as a credit on any new GPU they sell. This includes crossing over to AMD if the Vega release this winter has some sort of badass card.
So for example, if they go through with the pricedrop on the 1070 and it falls to $300-$350 around November, you can mail in your 1060, get $260 credit, and get a 1070 for $40-$90 out of pocket.