18-105mm is a very versatile focal range. I own the 18-200mm and I love it, but on any of my trips to tourist destinations, the 18-105 would have served me very well. I often take other lenses with me and end up not using them. If I do reach for another lens it is most apt to be a wider angle lens, not a longer lens. Even with the 18-200 I very rarely zoom past 105 and the vast majority of my shots are under 50mm. For me, anything longer than 105mm is likely a bird, squirrel, candid shot of a person, etc.