Hi I just recently got a Canon XS (my first DSLR) and have been playing a little with the kit lens and I really like it. I want to get a sencond lens that gives me more range. My budget for a new one is around $250 but I would like to keep it under $200. I am considering the Canon EF 75-300mm f/4-5.6 III USM for $192 (or $160 for the non USM version). Now the Canon EF-S 55-250mm IS cost a little more ($255) but I am trading 50mm for IS. Are these similar lenses? Am I better off with IS over the extra 50mm? Before anyone suggest to get an L lens,keep in mind that my wife and I have other financial priorities (want to build our house soon). Eventualy one day I might get one but now I just want something to learn and take better photographs.