This build is to upgrade my PLEX Media Server (PMS) from my macmini to something capable of multi-streaming, support on-the-fly transcoding of my OTA quad-tuner, and be able to rip any new movies to my library simultaneously. The build will reside in a dedicated media closet adjacent to the primary TV, so form factor wasn't (initially) a concern. However, this build has transformed several times over the course of a month. I originally planned to use a mid-tower and a Full-Size or ATX board with a multi-HDD array, but as time went on, I realized it would have been far more than i want or need. For this build, I planned to stay under the $1k USD (on new purchases) from the beginning and shopped around to get there. You may notice, I have several items marked as $0.00, that would otherwise cost another couple hundred dollars, like Windows and Microsoft Office, etc. So here goes...
Power Supply Notes: After building a couple theoretical Ryzen 7 setups through PCPartPicker, I found that my power consumption would be very low as I didn't plan to run a high-power Graphics Card. I stumbled across a brand new last year's model Corsair Gold 550W Semi-Modular PSU for $61.
Case Notes: I liked the "SG13B" ITX Case because it can fit a full-size power supply (which I already had). After a quick search online to see what a finished build looks like in an SG13, I was hooked. It's well under $50, fits a nearly full-size GPU (up to 10.5” long Graphics card if installing a 3.5” drive) and its small enough that I can tell my wife it’s a NAS without too many questions.
Motherboard: My local big-box (with a "Micro" name) had a huge pile of Motherboards on sale/clearance/open-box and with my eye on an 8-core Ryzen CPU, I found the 1800X (checked its passmark score) and got a $30 discount on an already marked down Motherboard. SOLD!
Drives: I wanted to take advantage of the M.2 slot for quick boot times and fast transcoding, so I picked up an Inland Pro 256GB M.2 NVMe (PCIe x2) SSD for much less than some name brands. It comes with a warranty and I'll be backing everything up to my NAS so I'm not worried about longevity right now. That paired with a shucked WD White Label 8TB drive and I'm set.
UPDATE: I'm finding that the read/write speeds of the 8TB drive are a larger bottleneck in my day-to-day usage then i had expected. Since it's still cost prohibitive to use SSDs for my local library, I'm considering shucking two 4-5TB portable 2.5" HDDs and run them in RAID 0 (striped). I'll post my findings once I've solved the issue for my rig.