I personally would like to see:

1. Syrakousai
2. Belgae/Nervii
3. Caledonii
4. Pergamon
5. Nabataia
6. Saba
7. Maszakata (Massagetae)
8. Chatti (or some such Germanic tribe)
9. Nubia/Kush
10. Massaesylii (or some such Numidian faction)

Incidentally, 'Bartix' was a joke faction conceived for a bit of light humour. It's not Bactria.