I'm excited you found this jewel, and even more to hear how much you enjoyed their works and the Haring exhibit.
My first visit was right after college, and I still recall seeing a Modigliani and Leger in person for the first time. If I recall correctly, the museum was only about 20 years old on my first visit.
Paris has embraced both modern and contemporary art far more than Italy, one of our other favorite places to visit often. The modern in Florence closed last summer shortly after our visit.
D and I adore Paris, and your post have absolutely made my/our week. Summering over in Santa Fe is wonderful, but Paris it is not.
