I would go with the 55-200mm, don't know if you have the possibility of changing spots quite easy, but do so if you can and keep an eye on your backgrounds, monopod can be useful, and practice a bit of panning with people running, you can get great shots that way. Careful with your shutting speed or you will have lots of blurry pictures. Presetting your camera beforehand on the spot the runners will pass will help a lot too.