Honestly, don't even bother with the official folio. It's basically a glorified magnetic wrap that won't do anything if you drop it on the floor of a ...
Before diving into boards, consider if you'll DIY the whole build. If not, many shops offer combo deals, mobo + CPU, sometimes cheaper. Asus boar...
Unfortunately, $500 might limit you. Aim for a used RTX 3070; its raster performance is still solid at 1440p. Frame generation tech helps too.