The latest rumored roster had:
I like your idea of having stanislaw on C9. IMO he's better than Golden because he offers higher fragging (which C9 needs unless RUSH can get good again) and he lets them play in NA qualifiers (which is most important probably).
I do feel like they need to get an AWPer and put autimatic back into his best role, and while JUGi is a gamble he could certainly pay off and potentially become one of C9's key firepowers.
And I agree with your North change too but keeping in mind what MSL accomplished with that team in his long time there cadiaN could win more and prove to be better, it isn't that hard of a task.