Since u are using d2x, why not buy those little Black X
Actually, I don't know which lens are little black X, it seems that they are all up to 200mm in focal length which is not enough for me. I need a 400mm to take the birds photo sometimes so I have bought the 80 - 400mm instead. Moreover, I do not need to take long range photo in dark (I don't like to watch concerts), so large aperature is not essential to me.