So my reasoning was thus: To make this box last for at least 10 years...
For the MB I wanted that external BLCK. For me, that meant that I could add better memory or peripherals which may not exist yet and need the OC just to happen. This meant an X370, but not all of them have it. Read the fine print if you want one. For example, the Gigabyte Gaming 5 does not have one, but the Gaming 5K and 7K does. But the 5 and the 7K are closer alike than the 5K to the 7K. I have no idea what they were thinking.
For the CPU I went with the 1600X as oppose to the 1700 or 1600 vanilla. I know I am going to upgrade the CPU sometime down the line (2600X?), but I wanted to have a slight edge now. What caught me was that the 1600X has the same guts as the 1800X, just two fewer cores.
Memory... ugh! I had to find something that was SS and Dual Channel, and with the darn Samsung B-Die. I am hedging a bet that my 3600 will be supported sometime down the road, perhaps as early has next month when AMD releases a new patch. For now, I am happy that I can hit 3200 out of the box because that is the highest you can go with the XMP and not fiddle with the timings and voltage (messy when dealing with RAM). I found it at a great price because no one was looking for 3600s (yet). They are all grabbing 3000 and 3200.
I made sure that my Win 10 was associated with my account. This disconnects me from the hardware checks. If you didn't already know Win 10 can be transferred as-is if you have the pro version. This is hands down the best thing they have ever done to the OS. I didn't have to sys-prep, or uninstall anything... just pull the drive from one machine and boot it up on the other. It found everything it needed in less than five minutes.
By the way, I am stable at 3.9 with 1.375v 63.5c with Prime95 torturing it.

I even loaded up City Skylines with Prime doing its thing and while the temps went up to @65c It was rock solid.
I will try for 4.0 tomorrow. It may not be worth it. I like the temps and voltage where they are at right now. Very much in the safe zone, very happy.