I don't build as often as I used to which was every 2-3 years. The last major build was my X99 6th generation HEDT system here: https://pcpartpicker.com/b/tbf8TW
Now it is approaching 5 years since that build and I got the itch to do another major transition going to a 9th Gen Coffee Lake platform. The recent Ryzen developments are great for the industry and I did seriously consider building another AMD system after many years since I built with Athlon-64 and Phenoms when they were competitive. AMD's price-to-performance record is getting much better. However, my primary usage does not require a large amount of cores. I decided a true 8-core without hyper-threading was an adequate balance for my needs so I went with the 9700K for it's strong single-threaded performance and ability to go 5GHz without difficulty. I found a discounted Z390 ASRock board at my local MicroCenter that was probably returned due to someone being too heavy-handed. I used my magnifying specs, re-aligned the CPU socket pins that were slightly off and it is working well now.
I selected the Corsair 760T case with nice easy access side panels and I still needed 5.25 bays for an optical blue-tooth drive and hot-swap drive bays for backup/clones. The Crucial DRAM and SSD drives are working great. I went with the Founders Edition RTX 2060 Super since I'm not a heavy gamer using less than 4K. SeaSonic is a highly recommended PSU manufacturer and 850W is a bit overkill but their sales w/rebate were a good deal at the time. All parts installed well and are working together nicely. The ASRock BIOS is easy to use with a nice UEFI layout. The motherboard has a minimal amount of RGB lighting without being too gaudy. I really like the POST code block option of actively monitoring temperature. It idles at 36 degress C and stays below 75C on moderate workloads at 5GHz.
UPDATE: I switched out the ASRock mobo for an EVGA Z390 FTW motherboard because it had more USB connections for my home office peripherals and audio USB digital-to-analog converters. There was nothing wrong with the ASRock, it just did not have all the rear I/O connections I needed. The BIOS for the EVGA mobo is nicely organized and makes overclocking simple as well. The BIOS comes with a handy stress test and automatic OC optimizer as demonstrated by ThinkComputers here: https://www.youtube.com/watch?v=7Mzn276PNTw. Easily adjusted to 5GHz and it even idles at a lower temp at 29C. It also has the post code block showing real-time CPU temperature which I like.