I was originally considering the 16-85mm, but due to some rather unusual circumstances I have been forced to consider the 18-105mm lens. Let me highlight what I think the differences between the two are, and perhaps people could confirm if I have it right. It would be great if you could add other difference as well. a) Build quality. 18-105mm uses mainly plastic construction, while 16-85mm is predominantly metal. b) Instant manual focus override for the 16-85mm. c) VRII for the 16-85mm instead of VRI for 18-105mm. d) Less distortion in the edges of the 16-85mm than the 18-105mm. Not sure about this one, can someone confirm? Would it be right to say that the IQ of both are the same, or is there a difference? Both have the same aperture range. All in all, do you think the faults described above is worth the $300 increase in price? The lens will go on a D90. Thanks.