My first build. It will be used for a small business/home office (SOHO) file server running FreeNAS. I intend to set it up with 1 vdev with 2x6TB drives, mirrored. I don't have globs of data so 6TB is fine for me, for now. I can always add more drives later if I need to.
The case supports up to 4 hot-swap HDD drives and 2 internal SSD's. The motherboard has 8 SATA ports (overkill for me right now), but it gives me the option to add even more drives in the future (although I would need a different case if I add more than 4 HDDs).
I chose to go with ECC compatible motherboard/CPU, and RAM, since that is recommended for FreeNAS. It wasn't easy finding a motherboard for this price that supports ECC!
The only thing I would do differently if I had to do it over again is I would have picked a SuperMicro motherboard to go with the SuperMicro case, since the front-panel cable on the case is proprietary and is designed to attach to a SuperMicro front-panel header on their motherboards. The cable from the SuperMicro case to the ASRock front-panel header are not compatible and I had to buy a Supermicro Front Panel Control Split cable (CBL-0084L) in order to attach the power, HDD led, etc (front panel stuff) from the case to the board. The cable was also not a 1 to 1 match to all the ASRock pins... I had to do a little rewiring of the cable pins... but not a big deal.
Everything seems to be staying pretty cool in the case with only one fan, but I only have 2 HDD's in it right now, and I purposely chose 5400 RPM drives to keep the temperatures low. The SSD seems to stay hotter than the drives. I mounted it to the top of the case... so it may not be getting as much airflow from the fan...that may be why. I moved the SSD location to the side-mount today. Will monitor it and see if it improves the temperature for the SSD.
So far everything is running smoothly. Will update this in a few weeks.