I would totally recommend a used HP Z230 (either SFF or normal size depending on how big you want it to be). You can put in a Xeon processor, ECC RAM, and you h

I would totally recommend a used HP Z230 (either SFF or normal size depending on how big you want it to be). You can put in a Xeon processor, ECC RAM, and you have multiple PCIe slots and SATA ports.