Want to start shooting some rugby pics from touchline with my d40. is a Nikon 55-200 going to be long enough..or am i better off getting the nikon 70-300Vr. Is it worth considering the sigma 70-300mm? Budget is tight..I have f2.8 ideas but f5.6 pockets, but i'd be gutted if I bought a lens that was too short or soft. Any opinions appreciated.....thanks.