I went with Star Wars, reviving my idea for a Knights of the Old Republic campaign in which Darth Revan was succeeded by a Sith Empress.
So far, all of these planets are from the Expanded Universe with no completely made up additions of my own. This is the most interesting region of the Galaxy in my opinion, where you get the Republic, the Jedi, the Sith Empire, the Hutts, Czerka Corp, the Mandalorians, and Adascorp, and can easily add in the Exchange. It has the homeworlds of the Arkanians, Cathar, Ithorians, Mandalorians, Miraluka, and Wookiees, which are all prominent races in the Old Republic; and also Gand, Trandoshans, and Weequay. Aside from Twi’leks, Duros, and Rodians, what else could one ever want? And those all have hyperspace engines.
The only other equally interesting region of the Galaxy is the one that holds Tatooine, Bothawui, Rodia, Ryloth, Sluis Van, and Sullust (and Geonosis, Kamino, Mustafar, and Naboo if you’re into that stuff). In a Rebellion campaign I would probably set my game there, but for the Old Republic there’s no space like Sith Space. But why limit yourself to a small part of the galaxy at all, when the movies very clearly make it look like you can jump from one end to the other in maybe an hour? Because if you give the players a map of the entire galaxy, it’s just way too much information. With a hyperdrive, the players can go almost anywhere at any time, and when every planet is an option, they are easily paralyzed by indecision and you have no way to have at least a little note card with the basic information at hand.
(Yes, you could make a map showing only selected planets all across the galaxy, but shush!)