Courty is indeed a splendid shop. I've spent many a dime there.
The online shop couteaux Berthier is also worth a visit (you can view the site in English). A well-stocked American site is Worldknives.
For a recommended next step, I suggest to try a "Le Compagnon" by
Chambriard (preferably not the small variant, you want the one with 3.5" blade). This is a lovely "Le Thiers" design, manufactured by multiple makers, and Chambriard is among the best for quality/price.
Also pick a nice
laguiole from a good brand. Fontenille-Pataud, Forge de Laguiole, and Laguiole en Aubrac come to mind. While not fully traditional, Fontenille-Pataud offers also a hyper-slick backlocking variant; and a smaller "gentlemen laguiole", also backlocking.
A classic, ancient design is the
Nontron. Handle nearly always in boxwood:
Two perfect timelessly styled folders by
Perceval are the wonderful Le Français and L-08:
Another really nice one (there are more though), a good example of a "neo-regional" knife, is the
L'Arconsat. The handle here is blonde horn, which I think looks great:
Finally, I don't want to be perceived as pimping my video reviews too much, but if you want to see more details of these knives, then watch clips 1,2,3,8,20,42,68,74 and 81 in
my list of youtube reviews. The above knives and a few more are discussed.