1. The above comment is correct. I only WISH the Asus ROG Strix Z370-G Gaming mobo was available for $80!!! That link actually goes to Amazon's listing for the previous board: ASRock H370M PRO4 .
2. Why no other boards priced under $200? And why only 6 Intel mainstream LGA-1151 boards? There's a ton of them out there and there have to be more than 6 that are good to use.
Your data on the MSI XPower Gameing AC is incorrect.
The board has 2 x Intel GBe LAN ports, not one.
There are 3 motherboard mounted M.2 Slots. The firsts two come from the chipset, not the CPU. The third is from the CPU. The M.2 expander card anables you to connect another two M.2 drives via a PCIe slot to the CPU lanes.
I own the Asus ROG Strix B450-F Gaming (with Ryzen 5 2600 and 16 GB G.Skill TridentZ RGB 3200) and I am very happy with it.
It has every feature I needed and I got it for a Great price ($90).
The MSI B450 Gaming PRO Carbon AC was the other MB I considered when putting this build together, it rated very well in quite a few reviews.