So I shoot Nikon D80, and want to upgrade from the kit lenses.. Is the 2.8 really worth twice the price of the 3.5/5.6 VR lens? ($1500 vs $800) Will the vibration reduction make up for the smaller aperature size and allow me to keep the shutter open for longer enough to gather the same light? Or should I just man-up and get the more expensive lens? I'm getting started shooting weddings, but so far they have been outdoor gigs and I've actually been reasonable happy with the results of the kit lenses... but the indoor shots (after the ceremony) have been lacking a bit due to low light issues. Let me know your thoughts.