Perhaps it hasnt' been mentioned yet because it's too obvious, but Guerlain is the FIRST and foremost house you should acquaint yourself with. Most of the Guerlain offerings are in the "classic" style, which may not be to your liking (yet), but try to view them in the context of reference fragrances. Other fragrance-only houses that you might want to try are The Different Company, Creed, Le Labo, and Tauer. All are mentioned frequently on Basenotes.
L'Artisan (mentioned previously) is an excellent start - they have an extensive line, are fairly easy to find, and have more youth appeal than some of the more established houses.
Everyone is entitled to his own opinions, but not his own facts. Daniel Moynihan