I jumped on the Sigma after it dropped $100 this month. $1,300 is half of Nikon VRII and still $400 less then used Nikon VRI. Used lenses are only a little cheaper then new ones. I don't know if 90 day warranty on refurbished stuff is enough. I'd rather have 5-6 years. I would either get a new Sigma or a new Nikon if one has the cash. Paying $400 more for something used doesn't make sense to me. And why would you spend all that money on an inferior model that obviously had problems since VRII had to come out. Just my personal preference.