Quote Originally Posted by Bootsiuv
That list is right on IMO, except for two things.

1. Take out Persian Rebels, and add the Attalids' Pergamon.
2. Take out Nabatea, and add the Kingdom of Kyrene.

Just my two cents.
I agree with Pergamon actually, but not sure why you would prefer Kyrene to Nabatea- it would probably be my next choice if there was a 31st faction slot though But Nabatea would do a lot more to challenge both the Ptolemies and Seleucids.