Vostok - you raise a good point about planets being destroyed/taken. The way i figure it, we work with the homeworlds in a vacuum. In other words, ignore what happened AFTER the time period we are looking at for each race, because otherwise it'll just make everything harder.
This means, of course, that we can ignore Alderaan's destruction because, by then, the Republic doesnt exist anymore anyway.
As for the Rebelion, i was thinking either Yavin IV, which i favour, or Dantooine, which has the added benefit of never being seen, and hence we can do whatever we want to it and cant be wrong.
Dark Lord of the Purists
Inter Arma Enim Silent Leges