Can you recommend some top-tier X-Men comic book storylines that delve into philosophical themes?

The 'Messiah Complex' storyline explores the implications of a mutant Messiah, raising questions about destiny and free will. 'Age of Apocalypse' presents a dystopian alternate reality where Magneto rules, forcing the X-Men to confront their values. 'House of M' drastically alters the mutant population, presenting a chilling exploration of power and control. 'Juggernaut's Legacy' deeply examines the concept of inherited power and its consequences.