This winter i am going to invest in a pro lens for the upcoming soccer and football season. I was attracted to the 180mm 2.8 because its supposably nikkors sharpest lens. The best would be to have a 70-200mm Vr but that aint going to happen. I guess my problem is, would it be wise to use a prime durning these events. How big is the 80-200mm compared to the 180 and 70-200mm?