These are the packages we need to install the most often so we recommend you to do the same on your Debian system to get the most out of it. But these are targeted to a productive system not a media center.
btrfs-tools fail2ban htop iotop lldpd mc nmon openssh-server smartmontools sshfs streamer sudo tree zip
atop apache2 libapache2-mod-geoip php php7.0-gd
For a desktop system install also
baobab filezilla gimp gparted libdvd-pkg openjdk-9-jre redshift vlc (clementine libreoffice)
clamav clamav-freshclam ecryptfs-utils nagios-plugins
You should check if there is a more current version of php and Java than mentioned here.