PC parts picker wont list actual prices.
Get ASUS B350 Pro Plus, Reduce the mem to 8 GB for now, upgrade later. Get an 850 EVO instead, NVME for now doesnt offer any massive benefits for the price you are paying. Only content creators benefit from it as of now. Get a 1070 mini/1080mini from Zotac. Also Antec VP650PM is more than enough, a 550 watt good PSU is enough
Dont spend so much on RAM now, you can always upgrade later when prices are down.
Im running at 8GB ram on my system,(also Ryzen 5 1600, GTX 1080).
In most games you will never notice the difference, only in dark souls 3 with stuff running in the background do I experience stuttering.
Upgrade RAM when its back to sane prices.
Good GPU brands : ASUS, Zotac, MSI, Gigabyte (for Nvidia)