Hi! I was wondering what would be the recommended upgrades to the T2i kit lenses: the 18-55mm and 55-250mm. I would like to have an all-around set of three, including a 50mm prime. Is there a tier to look at, maybe starting at a lower price range and moving up? I was thinking about maybe the Sigma 70-300mm instead of the Canon 55-250mm? I am interested in various photography, and wanted a zoom lens that would possible double as a macro. Thank you in advance!