I love the horses. It could be kind of like how the Chocobo raising is in Final Fantasy VII. If you get a weak horse you can strengthen it up. Breed them for better horse breeds. Sell them. It'd be neat.
I prefer the movie to the book to be honest, I'm a big Clarke fan but he has far better work out there if you're planning to get into any of his work any time soon. The movie does have a fabulous blu-ray transfer though, I hope you enjoy it. :hatsoff: