You could make a case for the Group 4 era, the era just before Group B, as being the greatest in rallying's history. Well, you could make a case for a lot of different eras being the best, but I'm thinking of writing up a history of Group 4.
It's probably easiest to just do retrospectives on individual events, but I can't seem to find any good overarching histories of the period. Might be fun to try and put one together.
If anybody's got any good links to share, or videos they adore, hit me up.