Clone Wars. Droid Wars (?)
The Republic will not use Clones, but fight against them. I like the idea of the Republic forces being based on droids with with live troops in a supporting role. The Jedi act as elite forces - specializing in both aerial/spacefighter combat and infantry engagements (two seemingly opposite areas of warfare).
Arrayed against them are The Clone Masters. They employ clone forces, genetically manufactured war beasts (like the xenomorphs in Alien), and later ally themselves with the Mandalorians to act as a counter to the Jedi.