Hi guys, I'm relatively new to photography but I am in the middle of a college coursework project and i'm finding the D40 18-55 stock to be a bit limiting. I will be using the lens mostly for night photography with long exposures. I also need something I can take with me to New York in February and on my various trips. I was looking at the 18-200vr but have heard it's not the sharpest of lenses. I also saw the 70-300 but I don't think it's what I need right now. I also know there is a 55-200 but I heard (amazon reviews) that it's not very good. Can someone who has experience or knows about any of these lenses ( or any others) give me some advice please? Thanks.