@Manko-sensei - I have two copies of the entire Ring on LP, including Solti's version, but I'd be inclined to suggest something along the lines of German symphony cycles (Brahms [4], Mendelssohn [5], Beethoven [9], Schubert [10, depending how you count], Mahler [10], Mozart [41-ish], or Haydn [104]).
@Angry_Panda of course, one of the reasons I suggested that is because it's one of those works that people only know partially (The Valkyries in this case, I use that as an alarm). You can't go wrong with those!