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I personally use the Jaybird X3's they really have great audio and are really comfortable for me.
Though they aren't the cheapest option out there though if you do look around I am sure you can get them for under $100 and to me they are good value for that price.
Here's a decent resource...
I personally use the MSI 970 Gaming and it works like a dream for me, I personally dont think motherboard and ram are super important. I usually just stick with a good brand like msi and go from there
I actually use the xiaomi air 13 for playing LoL and cs go and its runs perfectly well, though if you are wanting to play more taxing games it wont work as it only has 1 gd of dedicated video ram