Barleywine
The Rider Waite laid in my "I don't love you" box of decks for 14 years. I took it out late last year, and now I use it every week. While the artwork is landmark, it's not my favorite. But that deck reads like no other!
Same here. I'm a Thoth guy, so I never appreciated RWS very much until I started doing commentary in the Your Readings forum. I still don't pay much attention to the "canned stories" in the scenic minors, but I do make a lot of use of the "postures, gazes and gestures" of the human figures, along with the decans.