Of course the beauty of a "Successor" army is that most of it was be used for several armies . I have a large "generic" Successor army mainly of Aventine and Foundry. The core of pike, psiloi and cavalry can be used by early Successors all the way through to Demetrius' Seleucids. I then have units of Cataphracts, Scythed chariots, elephants, Galatians and "imitation legionaries" that allow my to "personalise" the army. A very versatile army to collect.