My two cents:
I wouldn't spend more than $150 on a mobo, unless what you picked has specific features you're looking for. People that have a bad experience are more likely to write a review for something, so as long as the mobo has generally positive reviews you should be good.
If you're willing to hunt for deals, 1070s can often be had for around $350 these days.
And as others have said, definitely need a bigger power supply. I would also get at least a Gold certified one because they're not much more, but that's just me.
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