Casual gaming and home theater PC. Connected to a 55" HDTV @ 1080p 60hz.
CPU + Motherboard: Originally planned to pick up a 2700x for $169 from Newegg's Black Friday preview ad, but couldn't resist going Zen 2 when they dropped the 3600x down to $199 on Thanksgiving. As a result I ended up spending a bit more on the board than I wanted, but the MSI B450 Carbon Pro had the best feature set and BIOS Flashback to guarantee out of the box Zen 2 support. Didn't even need it as it came Ryzen 3000 Ready. Only $15 more than the Tomahawk and is a way better board.
Graphics Card: I really wanted to pick up an RX 5700, but the only ones that were on sale were the ones with thermal issues and didn't feel like spending another 60% as all I need is 60 FPS for my 60 hz monitor. The MSI Ventus OC XS 1660 non-super and TI versions have great reviews for noise and thermals, so I went with that model for the Super (seeing as there were few reviews available at the time of purchase and the board/cooler design is identical).
Case: I'm most excited about the case, if you can believe that. It is quality beyond belief and I strongly recommend it to anyone. I wanted no clear side panel as this is for a home theater rig (who wants RGB lights when you are trying to watch a movie?) and I wanted it DEAD SILENT. This case is all that and more, and was pure joy to build with. Comes with two 140mm pure wings 2 silent fans (non-PWR but who cares?), and to that I added a third 140mm fan (this one PWR). You can get it with a clear side panel if that's what you are looking for.
Memory: Will likely do some video editing so upgraded to 32 GB of RAM, which was insane for only $109 for 3600 (2 x 16gb). Remember like 6 months ago when RAM was almost double what it is now? Why not go 32 gb?
Storage: I bought this drive on Black Friday 2018!! (Actually a couple of them and this one was still left over). Would have gone M.2 but honestly why spend more money? 1 TB Intel 660p would have been the choice if buying new.
PSU: Power supply was the cheapest acceptable. I've owned a number of EVGA power supplies and the dang things seem to last forever (I know I've now cursed this one!).