I'll be visiting an area of Southern Argentina affected by the eruption of the Puyehue-Cordon Caulle volcano in Chile, to the extent that, although people can visit or stay, airliners cannot fly, because volcanic ash is harmful to jet turbines. The purpose of the trip is not primarily photography, it is to visit family. I am trying to decide between taking (a) my older D50 with a single lens, a Tamron 17-50mm f/2.8 (without vibration reduction) or (b) a fuller photographic kit, including a D7000 and an SB-800. I am leaning toward (a) to avoid cleaning volcanic ash out of my stuff for the next six months. I realize that the D7000 and my good lenses are weather-sealed, but that is a relative term. I might be more comfortable with a camera which, if it gets too full of ash, I can write off. I recently picked up a lovely used Nikon 17-55mm f/2.8, so that the Tamron 17-50mm, as nice as it is, has become expendable. I've gotten many photos I'm very happy with using the D50, it's just much less expensive to replace. What would you suggest?