Feet, Clowns, Negars?!?? No! Favorite Concept Album.

The Lamb Lies Down On Broadway, Animals, Dreaming Neon Black, Mabool, Remedy Lane, and countless others...as for albums that only hint at being conceptual, Viva Emptiness comes to mind (though Jonas has denied that there's any storyline).
 
Dreaming Neon Black has always been my number one. Mindcrime, The Marriage of Heaven and Hell pt. 2, Brave Murder Day, Bregtatt, etc. etc.