I work for a community newspaper and am expected to report and take photos. I cover a variety of high school sports, as well as community events/meetings/etc. At our company, we buy and use all of our own gear. I currently own a Canon T3i and two lenses -- the kit 18-55 mm and a 75-300 mm zoom. I am looking for a lens that will produce quality shots of all the high school sports I cover, from basketball to football. I would like a versatile lens I can carry between games and other events. I could go from shooting a volleyball game on Wednesday to a beauty pageant on Saturday. Since I am purchasing the lens out of pocket myself, ideally I'd like to not go over $1,500. I have looked at the Sigma 50/500 mm, but am not sure if it is a good option. I found one on keh.com for less than $400, but it's rated "bargain" and is 70-79 percent quality. Also considering a 100/400 mm, but those are pricey. Any suggestions?