What about weight??
I do not know how much your other lenses weigh but the Nikon 18-200mm weighs 1.25 lb. Your earlier posts sounded like you might have small hands - this may be a heavier lens than you might expect. I have the 18-200 on my D300 so the camera is heavier than the D40 you have, but I a male with average hands and was surprised at the weight of the lens. This is probably because I had stopped using my film SLR for the last few years in favor of light weight digital cameras (not DSLRs). I am now used to the weight of the D300/18-200mm but they are heavy - something to consider when traveling overseas.