I'm going to buy a D40X in the next week or two. I am interested in taking pic's of pregnant women while pregnant, in labor, babies, and my own children and family. I really want to do some striking poses, black and white and more, some nude, some clothed......anyway, mostly of people not that I won't shoot a landscape every now and then or want some beautiful outside shots. What lens or lenses would you want if you were me? (Not too expensive) and any other equipment to accomplish this? Thanks!