I too am the man with many character concepts frustrated by the one faction rule. However if you want my advice, write a character sheet up in word or something first. Often after I write a finished product some of the gleam of a character wears off. No point in leaving your faction if you're just going to fall out of love with this character too.
Star Wars RolePlay
Officiant
Krajin
Join the BA! Or become a Senator! Or.. Or.... Crazy Evil Emperor? :P