Ok I have been looking into getting a SLR. I have been considering the D40. Is the only difference between the D40 and D60 the megapixels, and the D60 camera body can autofocus? My real confusion besides my everyday confusion is on the lens themselves. I am looking to be able to take pictures of my newts, fish, and etc, but I would also like to be able to take pictures of my kids or general type of photographs. Is there one lens for all? Or do I need two lenses. I see people are recommending the 18-55mm is that correct?