The macarons at Pierre Herme are worth just a trip to Paris. Have as many as you can.
Christian Constant at 37, rue Assas
Patrick Roger at 108, blvd St. Germain
La Maison du Chocolat at 225, rue du Faubourg St. Honore
Michael Chaudun at 149 Rue de l'Universite
Josephine Vannier at 4, rue du Pas de la Mule
Michel Cluizel at 201, rue St. Honore
The 6th arrondissement in particular has an abundance of excellent chocolate shops in a small compass. Among these are Christian Constant, Jean-Paul Hévin, a branch of La Maison du Chocolat, Patrick Roger, and Jean-Charles Rochoux. It's also a land of plenty for macarons. Both Ladurée and Pierre Hermé are in the area, as is Jean-Paul Hévin (which has superb chocolate macarons) and also Sadaharu Aoki, whose green tea macarons are particularly good, I think.
Most welcome. What I also did when I was in Paris was just to walk and look at the stores and found so many small chocolatiers on the way and I went into as many as I could and just bought a piece or two of chocolate to savor.
I hope you have an excellent time eating your way through Paris!
Clay Gordon had also mentioned that he had delicious hot chocolate at l'Etoile d'or. It has two locations: 9 rue Aligre or 94, Avenue Philippe Auguste.
Also go to Angelina for a hot chocolate although it may be a bit touristy.
Actually, I don't remember having hot chocolate at A l'Etoile d'Or - maybe you were misremembering my comments about la Charlotte du l'Isle. In any event I posted a blog article about my trip. Greger, you may find the article useful in helping plan your trip. Some of you may recognize the picture of my daughter Alex in front of Maison Steiger from the dedication page of my book.
Although I have not been there, Michel Chaudun comes highly recommended. You probably also want to think about which store to go to if a company has more than one. For example, you could go to the La Maison du Chocolat store on the Rue Fauborg St Honore because it's close to Cluizel, JP Hevin, and Angelina. However, the main LMdC store is on the Boulevard Madeleine off the Place Madeleine, near Fauchon, Hediard, and Marquie de Sevigny. Rough, I know, having to make such difficult choices!
Finally - Seby are you sure you have the address for A l'Etoile d'Or correct? When I visited them they were at 30, rue Fontaine near the Place Blanche metro stop. Also, so much of the store is about Ms Acabo that it's hard to believe that there could be two locations.
Before going to Paris you have to see Sofia Coppola film Marie Antoinette, and then, visit Debauve & Gallais, 30, Rue des Saints-Peres, Paris VII. Ask for Les pistoles de Marie Antoinette, specially the one with orange flavor, it's just amazing. The place is from another world, you feel like being at XVIII century.
My best regards,