Iran has a number of potential leaders.
Reza Pahlavi, the former shah's son it perhaps their most visible. Unfotunately, most of the other real leaders are either underground or in prison.
The "reformist" leaders are for the most part so tainted by their failure to make any real change that few will probably be relected to their parliment. Although if there are mass resignations from the parliment, then perhaps those still alive after the fall may be a candidate.
But to answer your question directly, Reza is the only potential leader, at this time. I don't have a position on him other than I think he is sincere, intellegent, and definitley pro American. He has published a book, Winds of Change:
http://www.amazon.com/exec/obidos/tg/detail/-/089526191X/qid=1056142709/sr=8-2/ref=sr_8_2/104-5083791-4106315?v=glance&s=books&n=507846 They claim he is planning on returning, but the date of his return is either uncertain or a secret.
Thanks! Reza is definately the most visible, and I agree with your assessment of him. I didn't realize most of the leaders were either underground or in prison, but it does make sense.
So, I guess Reza will have to lead from here, one of the leaders in the underground will have to emerge, or the people will have to do it on their own. Personally, I don't trust the "reformers"...they have let the people down.