Why do you need a more powerful NAS?
I don’t believe Xeon CPUs are appropriate for what Roon does. I had a dual Xeon motherboard and it was no better than my i3 NUC. Just because it’s a Xeon doesn’t necessarily make it more powerful. Of course, that would depend on the clock speed.
See longer discussion here, that I asked in a post a while back -
For 1/2 the money you can get an i5 NUC that will be quieter, much smaller and much more mission appropriate.
I’m guessing you’re are going to buy this Dell used on EBay? That’s were I bought mine. If that’s true, then $965 is an outrageous price. I think I paid less than $300 for my server.