I've re-based the Xystphoroi on the front of my rulebook (which was painted by Raglan) into wedge and added a second unit painted by Shaun McTague. Shaun will shortly paint a third regiment to match. I really like the look of wedges for Successor cavalry. There will be seven regiments in wedge, two in rhomboid and four in line in the Raphia battle, for a total thirteen.
Both units are of Polemarch riders, sold by Gripping Beast, on Aventine Successor horses. These are their older horse range- the new horses are slightly different but just as nice. These units can be deployed in line or wedge as I prefer.
After Raphia I plan to add some Alexandrian companions, some prodromoi, some Thracians and a whole load of Persians to the mix, which will permit me to re-fight most of the Successor battles.