Thanks, the Jonsbo N1 actually has five hotswap bays, and I believe you can squeeze in another 3.5" besides the PSU if you have a small PSU. I’ll consider the N3 but I don’t think it will fit where I have my current NAS so I’ll have to replan a bit.

Yes, I’m thinking about either getting a PCIE SAS HBA to open up the option for SAS drives, or to get an ASM1166 M.2 to 6xSATA.

You’re right that I’ve focused too much on ECC, I think I’ll see it as nice to have more than something I’d prefer to have.