Originally Posted by
thirdman
I'd go for a system more akin to that found in Warhammer Fantasy / Historical. Units are either HQ, Core, Support or Rare depending on the list, and there are limits on the number of points that can be spent in each type.
For example, no more than 25% of the list can come from HQ or Support, no more than 10% from Rare, and Core has to have at least 50% spent on it.
You can have different lists for each faction, where units might be Core in one variant but Support in another.