If you are going to go with a CPU that fast I would go with faster RAM. 3200 is the default speed for the new Ryzen chips. A lot of the reviews I have seen/read recommend 3600 for the 3700+ and up.
I am also not sure if you need 64 GB of ram. I am using 16 and I am not having any issues. Unless you are doing some crazy stuff 32 GB should be enough.
I actually went with the AMD Ryzen 9 3900X per Jophiel’s suggestion, but I’m going to stick with the RAM I already ordered since that was what CGDirector.com suggested. I am not confident enough about choosing CPUs, RAM and MOBOs to avoid screwing something up.
Yeah, 64 GB RAM is almost certainly overkill, but I can’t help thinking that I’ll need to get to that amount sooner or later.