I currently have a Canon Digital Rebel XT with the kit lens. I want to buy a new lens and I am looking at the Tamron 55-200 and the Tamron 70-300. I am interested in the pros and cons of these lenses, experience people have had with them, what kind of photos were taken with them and any other info that will help me decide what to get. I like to take landscape photographs and close up pictures of flowers and plants.