Debian Configuration :: All Packages Stable Except Deluge?

I am trying to keep a stable system (after a date with the unstable version which broke everything ) but a package (namely deluge) is horribly out-of-date. It is better in the unstable packages.I read the official documentation with the preferences file, pinning and the rest of the apt zoo but after a few tests I am still there with my old deluge in my stable environment.(in reality I managed to upgrade deluge by swapping the sources.list file with one with only the unstable repositories -- but this is not a particularly clever approach)I would be very grateful if someone could give me the right content for the preferences file which would allow to keep the system at stable level, except for the deluge package which should be updated to the newest, bleeding edge version.