My first thought was Les Ombres restaurant, but old CH reviews scare me off (pretty setting; terrible food). My knowledge of Paris geography is still not great; Since the museum is in the 7th, these were restos that I am considering:
La Table de Vietnam, While it looks to be very close to the museum, many reviews I read indicated that the prices were a bit high for the food [perhaps due to the location?]. We ate pretty regularly at a small, family-owned Vietnamese restaurant at home, so we're used to very good food at very reasonable prices. Perhaps the Parisian counterpart might be a disappointment;
Restaurant David Toutain -- I know it's one of the "hottest" new restos, but I like the Dan Barber/Blue Hill inspiration. I also feel like this meal would be more formal than La Table de Vietnam!
Le 122: Is this owned by the couple who used to run the now defunct Hier et Aujourd'hi in the 17th? We had had an amazing meal there our first trip to Paris.
Alain Milliat -- maybe I want to just try their fruit nectars?? Do people find the menu too limited?
In compiling this list, I realize that all four restaurants offer very different experiences. We are not those who have to eat at "the best" resto in the area. We're basically looking for a memorable meal, and one where we don't feel that we've had to pay exorbitantly for the privilege.