I think I am going with the non OS. When I bought my D5100 I was really looking at the K-r (in body stabilization and focus) and the thing that drew me away was the focusing issues with indoor lighting. I could buy a K-r, Sigma 70-200 f2.8, and Sigma 17-50 f2.8 for the price of the Nikkor 70-200 VR II.