One of my favorite Hepburn/Tracy films is one written by Nora Ephron's parents, Desk Set. It's a witty mature romance. You simply couldn't make it as a story set today with the computer-replaces/displaces-human premise however, considering the ever-shrinking footprint of modern computers.

I also thought Hitchcock remade more of his early films, but I can't find which they might be. I am sure I once "knew" what the others were (or thought I knew!)

Considering Hepburn, the remake of The Philadelphia Story into High Society was pretty good--though I thought Bing was way too old for Grace. Some other films made by Grant and Hepburn (though not together), like Arsenic and Old Lace and African Queen (after which Hepburn wrote a book called something like "How I Went to Africa with Bogart and Bacall and Nearly Lost My Mind") are sacrosanct.

SRS