At this point I have Plex and Overseer hooked up to Prowlarr, Sonarr, Lidarr and Radarr, with Prowlarr connected to my nzb client and server (it was easy to cut over from transmission, using the secure ports to talk the news hosting and client accounts). Everything is spun up in docker using the linuxserverio images.
I might be mixing up some terms there, but that setup has made downloading content so much easier and quicker.
My current setup:
Plex (Media Content Manager, desktop, mobile, tv apps. Local and external) - https://www.plex.tv/
Overserr (Allows users to request content) - https://overseerr.dev
Prowlarr (Configure your torrent/usenet indexers, Radarr, Sonarr, Lidarr point to Prowlarr) - https://prowlarr.com/
Radarr (Movies) - https://radarr.video/
Sonarr (TV) - https://sonarr.tv/
Lidarr (Music) - https://lidarr.audio/
NZBGet (nzb download client, configure nzb newhosting site, Radarr, Sonarr, Lidarr point NZBGet to download content. I pay for one newshosting site and two separate indexers) - https://nzbget.net/