Civs are more unique than I thought. For Example...
  Galactic Empire Tech Tree
 Strong Units: Mech and Troopers 
 * Aircraft take 5% longer to build and are 5%
 more expensive 
 Unique Unit: Dark Trooper (Trooper) 
 Unique Technologies: Walker Research (Mech
 Factory); Altered Bargains (Spaceport). 
 civilization Bonus: Upgrades to Heavy Mechs
 are 5% less expensive than other civs.  
http://swgb.heavengames.com/images/units/empire/darktrooperphase1.gif)