i'll buy the big box set to get the staff and casualties. so if i get two extra sets i already have, i can beef up companies and have conversion figures. the naval artillery set would be a good one for conversions. since i only had one set to begin with, i didn't want to alter my originals. i suppose it's 'set integrity'...keeping it intact somewhat. hat used to give out four officers in an infantry set, so you could always convert two and not really lose anything. i guess the 'big box' concept is pricey, but a good option for some people.