I'm currently using the kid lens that came with my Canon 350D, the EF-S 18-55mm, but I'm thinking about buying a new lens. I saw the Sigma 18-200mm lens in a shop and would like to hear some critiques on it. In the shop it would be 345euros, is that a reasonable price? Or would I do better buying a completely different lens. I'm looking for a good allround lens... Thank you!