I am interested in purchasing a Nikon D80 with a Nikon 18-135mm f/3.5-5.6 ED-IF AF-S DX Lens. What additional lens would you recommend in the 300-400 dollar range (or less). I am most likely to use this to take scenic photos. I am particuarly interested in hiking up mountains and taking photos from a distance. I am not all too familar with Lens so I would like some opinions. Thanks.