The HDDs alone should be roughly ~1,000€. The rest of the build sounds pretty much like your other machine, just with a different processor.
I run my YunoHost in a VM with like ~8GB of RAM allocated. You can move everything to one single machine if you set up some reverse proxy for all the web frontends.
36TB of storage and 64GB of RAM should be plenty.
I think I get it. I mean in that situation you’d essentially pay to get some SATA ports and the space to put the harddrives. The money doesn’t really get you anything else that’d be fundamentally different from the current setup.
Idk, I’m fine with 48GB of RAM to run a lot of services and containers. And I don’t use a separate machine for storage, the hypervisor does that and I either share the filesystems via NFS or pass them through into some VM. And I don’t think a fast machine with lots of RAM is needed for storage, unless you’re using ZFS.