An Ethiopia map could be some much more than this... I must agree with the fact that another 'country-map' needs to have something extra, gameplay-wise or just as a theme. The reason why I like the map Celtic Nations, you see: actual geography with an extra theme.
But Ethiopia is covered with great themes and facts. For example, did you know that ethiopia has it owns alphabet and the oldest language (Ge'ez). It still uses the Julian Calender (so, on behalf of this, I wish you a nice New Year, Enkutatash on the 11th of september). Ethiopia had the oldest traceable monarchy, according to the legend descending from the root of Judah, in the form of the sun of Queen of Sheba and the biblical Solomon. Ethiopia has its own bible and is based on some holy fundations from the ancient kingdom of Axum. It has been an christian 'island' in africa for long time and now have even its own jews (Falashas, who believe ethiopia is the Holy Land). Ethiopa claims to have the Ark of the Covenant.
Most important: it has never been, as the only country in Africa, a colony. It's monarchy has never been conquered ( the emperor went in banishment in England during Italian invasion. ) Pretty strange country eh?
If you're looking for a battle, look for the battle of Adowa,the Italo-Abyssinian War or the Ethiopian annexation of Eritrea or just the victory of the united forces of Ethiopian rebels, Mau Mau warriors, British and swedish (?) forces over the Italian invaders in WW2.
for this, check out this short speech:
http://www.youtube.com/watch?v=_fiDDOs60ewAnother idea: Ethiopia had a for a very long time a feudal system where dukes (called Ras) reigned their own territories. The unification of Ethiopia by ending this system caused of course major troubles.
For detailed recent istory, this is a fine page:
http://www.historyworld.net/wrldhis/Pla ... raphID=pdvJust some thoughts,
hope to see some depth now
wish you good luck with it