I saw this bubble up with the new forum format, so I thought I'd get it going again. I have more PCs that I know what to do with, and a couple with lots more mojo, but I have a thing for SFF.
My parts-bin HTPC, built on a thin mini ITX. I popped in a used i5 6500, a used 128gb NVMe stick, 8gb of cheapo DDR4 laptop ram ...and that's all it has room for. It screams with KDE Linux. Perfect for Youtube/Netflix/Amazon Prime/Qobuz/Tidal. The low-profile fan wasn't low-profile enough, so I made room for it with a hole saw
And while I'm here, another oddball. I ripped out the squeeling squirrel-cage proprietary hard drive-fan that would have cost an arm-and-a-leg to replace (Seriously Apple?) and installed a used SSD. While I was at it, I corrected the O/S. It's OK for streaming content in a spare room, and that's about it. If the CPU fan goes out, I'll probably use it for target practice.
Here's the rig (smoked window off for clarity). Specs are ASRock X570M Pro4 mobo, R7 3700X, EVGA 1060 6GB (soon to be either 5700XT or 2070 Super), Cryorig H5 Ultimate Cooler, 32GB of G.Skill Trident Z Neo RAM, 3.5TB total storage for now (500GB M.2 NVMe for boot/programs, 1TB M.2 NVMe for games, 2TB 2.5" SSD for photos/media/storage), Noctua case fans, Meshify C Mini case. Built it for CAD, photo editing and casual gaming.
You got me beat on quality, but I have the quantity. More oddballs. 3 beater convertible laptop/tablets. Each running GIS software and a GPS receiver. Testing outside for satellite acquisition, GPS precision, and software reliability. Used for GPS based autocross course setup.
You've got a fun hobby! I built mine with the intention of minimal upgrades for at least a few years. I knew I'd be upgrading the GPU sooner than later, but I couldn't pass up a $120 deal on a refurbished 6GB 1060. I can likely sell it for what I bought it, too.
Sigh...I'm feeling rather ADD at work today, so even more oddball PC builds. I'm not a gamer, but pretty much find any other use for a PC.
How about a lowly AMD A8-7600, watercooled, in a 2U rackmount case. What for? Audio DSP processing in Linux for my monster 4-way garage stereo. Dual monitors - one for the music software, one for twiddling virtual knobs.