Actually, Freak on a Leash isn't a bad idea. I'm not a big Korn fan but I think that song would work for me. It's heavy and angry, but it's got kind of a slow, grooving rythmn that would be good for running at mile race pace.
It would be perfect for someone who was looking to run a 4:00 mile. The song itself is roughly 4:15 in length, and that kickass breakdown towards the end of the song would start right as you were starting the bell lap (about 3:05). That would pump you up for the final kick.