Red Rising. The only books I've read that had me on the edge during most of the reading and its battle scenes and twists would be grand in a high budget adaptation. It's also modern and inclusive, so you wouldn't have all these "race" or sexual identity shenanigans/discussions, as those are logically included in the source material.

Although I wouldn't know how to portray the different colours. Casting's gonna be hell for that. You would probably have to tweak that concept for live action a little. Don't think there are that many actors with the frame of Lebron around.