Seven is phenomenal. Was lucky to see it on the big screen a couple years ago and it's so draining in the best way. People were dead silent walking out. "John Doe has the upper hand" is one of the most chilling lines in filmdom.
I might entertain the Coogler possibility if the movie was a Fury Road-level incredible directorial accomplishment. But it's not. It's just a solidly crafted blockbuster. Nothing is too big to ignore. Black Panther will get its due in stuff like costumes and makeup and with any luck the Academy will have black directors to nominate besides Coogler.
Over the Rainbow = automatic waterworks and it's amazingly surreal for a kids' film at times (I wish today's PG fantasy movies would remember what that's like) but I've never been too crazy about The Wizard of Oz otherwise. Maybe partly because I didn't see it until I was 19.