I sit with the same Dilema, I am looking at moving to Kitwe, and my Children are 2 and 6 years old. I have read on the net that 50% of all malaria deaths in Zambia are kids under the age of 5 years old. This is scarry facts. It seems however that the majority of these cases are people from rural areas, and they do not really know what they are dealing with, and take no precautions. I am of the opinion that if you are really carefull, you can eliminate the risk.
But I must say, the Malaria thing will be deciding factor whether I go or not, especialy because my kids are still so small.