Con, AA, Scout, Raider, Riot, Assault, Skirmish, Arty, Support(Bombs,Cloak,Shield)
The reason for AA after the con is, that it is the only unit which interacts with air - it is important (against 2 factories) and should not get forgotten.
After that, order units by range.
Bombs should be behind arty, because it need skill to use them.
Same for Cloak and shield.
BTW : Gunships and Planes are good as they are.