Personally, I'd never shoot with a lens with such a long zoom range. Its very expensive, slow, and the image quality is poor. If you need the range, get the 18-55 and the 55-200 and keep the 55-200 mounted just in case you don't want to miss a good wildlife shot. Landscapes don't go anywhere, so you don't need a wide lens mounted at all times. If the budget permits, I would go with a Tamron 17-50 2.8 and a 55-200.