Every good one's already been mentioned. I was gonna say Dooku, he's defenitely more than just a force user, he knows how to have influence.
Jaina Solo Fel can heal people, so she's a must, and so can Yaddle, maybe Plagueis, and Mace Windu is a good general.
People say Galen Marek, but Mara Jade was also an imperial assassin.
Dark Empire Palpatine is the most destructive mortal being in existence
Anakin (knighfall would be powerful, but he's untrustworthy, and as always, an idiot, and would fare much better as just plain old zonakin)
Wyyrlock has some experience with ruling.
Luke, Revan, Vitiate, maybe Darth Vader, Naga Sadow, Nihilus, probably more