New to the forum and the DSLR world. I purchased a Canon D60 with the 18-200mm lens. I have a trip planned for the end of August to Jackson Hole Wy for a couple of days fishing followed by a day trip to Yellowstone. I want to purchase a secondary lens to bring with me for wildlife and landscape photography, looking to spend around $1,500. Looking for some feedback on which lens would be appropriate. Or is the lens I currently have good enough?