So I'd like to get a telephoto lens for the d3100 that is coming tomorrow . I've heard good things about both lenses, and both are in my pricing range. However, I can't decide between the Nikkor and the Sigma lens. The Nikon has the VR but the Sigma has an extra 100mm to it. It also has a 'macro' mode, but I'm not sure whether that's a gimmick or not. Which lens would you prefer?