The Iron Duke range is simply the best ever! But as already mentioned some of the older (smaller) Foundryfigures are so good despite their age it seem a shame not to use them.
For those so inclined is is a small thing to bring the Foundry figures to the same height as the newer Iron Dukes. In most cases it is just a matter of lengthening the upper legs as can be seen in the comparison pictures below. Takes about five minutes to saw through the legs, insert a metal pin and fill the gap with Magic Sculpt or Green Stuff. Not really useful for entire regiments but for those occasional figures quite do-able.
The two on the right are Foundry, left an Iron Duke one.