yeah, upgrading from a 970 to a 1060 isn't much of an upgrade. The 1060 is only marginally faster.
edit: if you go for a 1060, just get whichever one is cheapest. The SC/OC versions are just gimmicks. They are OC'ed but most of the time rarely offer more than a few FPS over stock. The FTW/OC/SC versions typically have better cooling and maybe some RGB lighting. If those things are important to you then go with one of them. Otherwise a vanilla version is just fine. Asus/MSI/EVGA are all good brands with decent warranties. Much of the same really. Personally I like my Asus Dual 1060.