Well, it would definitely give you the range you need on a digital (it becomes "equivalent" to 128-320mm on a Canon dSLR); on film 200mm might still be a little too short, but there's not much you can really do about that. The main problem is that for your budget it's very difficult to buy a lens that has both the necessary focal length and the wide maximum aperture that would let you use a fast enough shutter speed to freeze the action. It's not what you want to hear, but your best option would probably be spending more than double your budget on a Canon digital SLR - that way you could safely use 3200 ISO with the lens you already have.