Hi! I was wondering what would be the recommended upgrades for 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 the Sigma 70-300mm instead of the Canon 55-250mm. I am interested in various photography and want a zoom lens that would possibly double as a macro. Thank you in advance!