Your fine lol.
Gigabyte has very good motherboards along with Asus, MSI is good but I personally am not a big fan of their BIOS layout, just me though. Their good motherboards either way.
All the motherboards you listed are good, so chose whichever one you like the most.
The 21st is most likely going to be a soft launch for Coffee Lake, meaning Coffee Lake will only be launching on select notebooks and other devices like that, and that's it. Expect desktop Coffee Lake CPUs in early Q1 of 2018.