So I'm going back to my original plan and sticking with the ASRock DeskMini. It's cheaper than going with the $70 Inwin Case and the $120 Motherboard I posted above.
I see that NewEgg carries the rear audio cable accessory for $15, so I'll throw that in; their monitor is old enough that it only sports DVI & VGA, so I'll need a way to get audio out of the computer. It actually has built-in speakers, but those connect via a 3.5mm jack, so even if I opted to use that I'd still need a way to get audio out of the computer. That being said, the Creative Pebble speakers I picked out look pretty neat, apparently sound good for their price, and ain't that expensive, so in the cart they go.
Downgraded from the Ryzen 3 to the Athlon 3000G, because the more I think about it honestly even the Ryzen 3 is overkill for their needs. Also downgraded from 16GB of RAM to 8GB, as 16GB is similarly overkill. If I find that it's limiting for them in a few years I'll swap it out for 16GB at that time.
Was gonna opt for the often recommended Crucial MX500 SSD, but the Western Digital SN550 is apparently a bit faster and is only about $10 more to boot. I checked via Teamviewer last night and they're currently only using about 70GB of a 1TB HDD. If the drive in their current computer is a 2.5" drive by miracle, I'll carry it over to be used as an Windows Backup drive, or maybe even drop it into an enclosure for backups that way.
I was initially concerned about the DeskMini's lack of USB ports, but I believe they're only using four right now: a wireless mouse receiver, a USB keyboard, a USB scanner and USB power for a dinky set of Acer speakers that shipped with their current computer. I'm replacing their keyboard and mouse with a new set that'll use a shared USB port, so that saves one port, which I think will make the included USB ports sufficient. (USB Power for Pebble Speakers & KB&M receiver on the back, scanner on the front.)
Worst case scenario I'll pick up the $8 cable for additional USB ports down the line.
That's more or less it. I'd love suggestions on where to get legitimate Windows 10 keys, as if I can avoid paying the full $100 for that, I certainly won't complain.
PCPartPicker Part List
CPU: AMD Athlon 3000G 3.5 GHz Dual-Core Processor ($54.99 @ B&H)
Memory: Crucial 8 GB (2 x 4 GB) DDR4-2400 Memory ($31.99 @ Amazon)
Storage: Western Digital Blue SN550 250 GB M.2-2280 NVME Solid State Drive ($54.99 @ Amazon)
Keyboard: Microsoft Desktop 900 Wireless Standard Keyboard With Optical Mouse ($29.32 @ Amazon)
Custom: ASRock DESKMINI A300W AMD Socket AM4 1 x HDMI Barebone System ($149.99)
Custom: Creative Pebble Plus 2.1 USB-Powered Desktop Speakers with Down-Firing Subwoofer and Far-Field Drivers, Up to 8W RMS Total Power for PCs and Laptops (Black) ($39.99 @ Amazon)
Custom: ASRock Deskmini A300 REAR AUDIO CABLE Barebone Accessory ($14.98 @ Newegg)
Total: $376.25
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2020-01-24 15:01 EST-0500