La Nuit definitely fits that category (great fragrance). L'Instant de Guerlain (both the EDT and EDP) are something in that category. They have a cacao vibe, very elegant fragrances. Dior Homme and even Dior Homme Intense are also formal scents, a bit more on the metrosexual side, also quite sexy (both vintage and new formulations are fantastic regardless of what is said around here). Another one that I would recommend, and this is a bit different that the ones i mentioned, is Prada Amber Pour Homme. It's a soapy, clean, sophisticated fragrance, very fancy. All of the ones I mentioned above have great projection and longevity and would deliver big time in the formal category.