Help choosing PC for server - Divisions by zero

Hi hosters, First timer here - just found this nice little instance. I’m looking for a semi budget PC as my new server. I currently have a raspberry pi 5 for syncthing and torrent client and a Synology 1515+ for storage (used to also host nextcloud, jellyfin, bitwarden, but became too slow for jellyfin encoding). Will probably run opensuse, fedora or mint. Budget is flexible, ~280-380 euros. The primary requirement is that it can do both 264/265 encode and stream to two concurrent clients without any problems. 1080p is a need to have, 4k nice to have. Will also run torrents, maybe a game server and some kind of file sync. Media files will be stored on Synology nas. Will be buying used or refurbished. I have been looking at the following in different price ranges: EliteDesk 800 G5 Mini (i5-9500T) M710q Tiny OptiPlex 3060 Micro ProDesk 400 G4 Mini Which of these would you chose? Or other suggestions?