My brand new NZXT H200 build. I wanted something small, powerful and clean and I think I've achieved that.
Specs: i9-9900K, Noctua NH-D15S, ASRock Z390 Phantom Gaming-ITX, 32GB RAM, 1 x 256GB Samsung 970 EVO Pro Plus and a Corsair SF-600 PSU.
I don't have a graphics card installed at the moment but I might put my GTX 970 in or upgrade to something newer. I've also got 1 x 1TB SSD and 1 x 8TB HDD to add back now I've got Windows installed.
CPU's currently idling at 26C which doesn't seem too bad. Might overclock it at some point but the main reason for the system was the increased core count over my i5-4670K for gaming and labs. I would've preferred to go down the AMD route but Microsoft still don't support nested Hyper-V on Ryzen and I use that feature a lot.
Edit: Replaced the two stock case fans with Noctua NF-S12A PWM fans because the case fan was running full pelt. Had to remove the CPU cooler in the process and now it's all back together the CPU idle temp is 24C and it's inaudible.