I’ll just drop this here again, it’s the updated version of the T7500 I currently use…
I’d probably start with a setup similar to this, at 1600 you’re getting massive cpu power(more cores and ghz than the T7500 on my list with a newer arch) 196Gb of ram and you just need to add drives and a gpu.
Drive wise I’d probably get a few of these for your edit drives, they’re not the fastest but at that price they don’t need to be
and the GPU is dealers choice, personally I like nvidia cards and blower coolers, it looks like the RTX blower cooler cards aren’t out yet but it’s hard to go wrong with a 1080 ti still