I purchased Equipe 50 DS. I have to say I am quite satisfied with it. The only main difference between the 50 and 80 DS is
the the shocks as well as the derailleurs.
50 DS is a beginner setup(that's me). If you don''t mind spending a bit more for a few improvements, go with the 80 DS, otherwise save a bit more and go with 50 DS. You can do the upgrades later on.