If you're going with an R5 3600, there isn't a reason to get the X570 boards. I'd only bother with the X570 boards if you plan on overclocking an R9 3900X or 3950X (the good B450 boards can handle them fine stock and the B450i Gaming Plus AC can actually handle some overclocking on the 3900X and potentially the 3950X if you have a fan blowing on the VRM heatsink).
The MSi B450 Gaming Pro Carbon AC has Intel LAN and Intel WLAN (9260 so dual-band AC and Bluetooth 5) and is $130, plus there's no heatsink fan so there's one less moving part to fail over time. The carbon fiber stickers look like they're removable so if you peel those off, you should get a really clean looking board. It has BIOS flashback so if you happen to get a board without the Ryzen 3000 supporting BIOS preflashed, you won't need to ask your vendor or AMD for one of those spare Athlons to flash.
For RAM I'd just get the 2x16 GB Crucial Ballistix Sport LT 3000 or 3200MHz ($140-$150) and just overclock it to 3600-3800MHz to max out the infinity fabric clock while staying in 1:1 MCLK:FCLK mode. Just use the timings from the Ryzen DRAM calculator.
For the monitor, the LG one you listed is equally as good as the others despite being the least expensive of the bunch. Review: https://pcmonitors.info/reviews/lg-32gk850f/
The Gigabyte and ASUS ones are more expensive than the LG for no good reason (I can't actually find a price for the Gigabyte but I imagine it is) and the Samsung...well if you want a curved display, go ahead. That's up to you.
HDR isn't particularly worthwhile because there's too many competing HDR standards and not a lot of HDR content. I can only think of a few stray YouTube videos and a handful of movies on Netflix and I think the latter are for the HDR10 and Dolby Vision standards. For the LG, going into HDR mode actually hurts your contrast ratio among other things.
Since you're primarily gaming anyways, the slightly worse off-axis color reproduction on VA compared to IPS (but far better than TN) isn't a big deal since you're not doing color critical work. The extra contrast ratio for going with VA is probably going to be more worthwhile.