I need your thoughts on lenses if you have a couple minutes. I bought a Nikon D90 that came with an 18-55 DX 1:3.5-5.6G VR lens and a 55-200 1:4-5.6 ED DX VR lens. Recently I started seeing the Nikon 18-200mm f/3.5-5.6 G ED-IF AF-S VR DX being talked about. I really don't like having to keep switching my lenses while shooting. I mostly shoot for fun at NASCAR races, landscapes, sometimes people or animals. I don't want to step back in speed and clarity from what I have... Would the Nikon 18-200 lens be a good change? Thanks for any insight you might be able to give!