Pretty new to self-hosting type stuff, so I went with a Synology NAS when building my setup this spring. Got a DS923+ and two Seagate 12 TB IronWolf drives, and for overkill, added an extra 4 GB of RAM (for a total of 8). There was a lot of fuss on the Reddit threads I browsed about the later Synologys being bad for Plex, but that wasn't really a concern for me since I have Plex on an Nvidia Shield.
I've got Sonarr / Radarr, with Bazarr for subs, Prowlarr for torrent index management, and Overseerr for day-to-day interaction with the stack. Using Portainer to manage all my docker containers, and Watchtower for auto-updating most of them. Downloads are through qBittorrent with gluetun for VPN. I was using Mullvad with port forwarding but now that's going away, I'm probably going to switch over to Proton VPN. Not really looking forward to doing that reconfiguration.
I wasn't quite sure this was all worth the effort until everything lined up and I started submitting downloads through Overseer - it's SO nice to send movies or tv shows to be downloaded through a snazzy UI.
Future plans include setting up a self-hosted photo library browser, and some kind of self-hosted music setup, though most of my downloads are from Soulseek and nothing *Arr really supports that as a source last I looked into it.