Not the biggest anime fan, but I love anime with good plots and philosophical foundations.
Fullmetal Alchemist: Brotherhood
Sounds like you'd love MD Geist, Legend of Blue Wolves, Dragonaut: The Ressonance, or Ghost Slide.
try shingeki no kyojin, Kaiji and Evangelion
I recommend ボクノピコ and Bible Black.
If you want philosophical, you should try Master of Martial Hearts.