Do you like vetiver? If so, try Vetiver by Guerlain (I prefer the Eau de Cologne version, not the easy-to-find Eau de Toilette) or Grey Vetiver by Tom Ford.
You might want to sample these 'classics' that I think every Basenoter should at least try once: Rive Gauche Pour Homme by YSL, Terre de Hermes by Hermes, Habit Rouge by Guerlain (again, the EdC version I prefer over the EdT), L' Air du Desert Marocain by Tauer...to name a few.
Oh and yes, please investigate Egoiste, which I love - but make sure you try Egoiste not Platinum Egoiste (which is what you see in US stores). Antaeus by Chanel is a classic, but sadly the juice on shelves now has been reformulated so I would hesitate suggesting it, unless you can source an old, vintage bottle.