Update on my TrueNAS solution

So I made a mistake. And a big one. I jumped the gun with my choices for the motherboard, cpu & memory.  My original post has a nice list for a very nice PC, not one that is really good for this purpose.  

The use of ECC capable memory, cpu and motherboard is paramount for a ZFS based storage solution.  So what to do. Already purchased these components and are nice mid-range specs.