Hi, I'm currently using a bridging camera (Nikon P100) and I'm considering upgrading the Canon 600D but I'm not sure what lenses to get. Initially I was going to go with the twin lens kit but as I like to travel I'm not keen on lugging around stuff that I might not use. So I was thinking of getting the 600D body with the Canon 18-200mm lens or the Sigma 18-250mm lens. Does anyone have any advice please?

Thanks!