In my opinion, 64 GB of RAM is plenty. If you have unlimited budget, sure go bigger, but if you're already running at 100% with 64GB, 96GB won't make you run faster.
As for internal storage, I find that to be a convience. I think 1TB is a great size. Plenty of scratch disc/temp storage space before moving files off to permanent NAS or external RAID devices. Obviously, this depends on your particular workflow but it sounds like you know what you're doing so I think you're on the right path here.
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