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My two cents. Current setup will work fine with a gtx 1060 or 1070 (I already stated my preference earlier). Don't get hung up on RAM and/or...
If you're looking to buy into 4K somewhere next year, get the 1070 now. You'll regret it next year otherwise.
Simple. You speak of 1080p, but what of 4k? If you're not going to be using a 4k monitor anytime soon you're good with the 1060. However, if you...