Genius question!
I sense I might spend all day going "Oh dear, I forgot ..." but right now I'd go with:
Single : Ric Flair Vs. Ricky Steamboat, Chi-Town Rumble 1989
Tag: Hart Foundation Vs. British Bulldogs, WWF, 1991
PPV: Wrestlemania 17
OR the first ECW One Night Stand
Best Of: Probably WWE's Mick Foleys Greatest Hits and Misses (the HITC against Taker, the incredable hardcore match against Orton from Backlash 2004) or ROH's Best Of CM Punk DVD.
I might be editing this post many times today.