Probably Ryzen 5, depends if Intel plans on rushing out their new line-up though with higher core count for their "consumer" chips.
I plan to upgrade the CPU this summer, the motherboard and RAM will obviously come with it.
+1 For amazing design. Seriously where did you get those logos?
A 970 is overkill for Xcom 2 btw, unless you are doing higher than 1080p.
Nice build. Would wait a year or two before upgrading gpu.