Re: Which Hokage are you most excited to hear the "truth" from?
Whoever gets Sasuke to scream, cry, and care about him. Seriously.
Hashi - "What is a village, what is a clan, where the Uchiha oppressed" The Foundation of the Leaf can be explained.
Tobi(rama)-Probably him, because Sasuke will ask him "Is it true the Police Force was a cover up of spying on Uchiha, and not as a sign of trust? Is it you who relocated the Uchiha so it would be easier to slaughter them"? I'd like Sasuke to angrily say it like that.
Hiruzen- "Why and HOW could you order the slaughter of my family? Where they not part of Konoha? Where they nothing more then enemies to you? And you would make sure they are all killed? If you didn't agree with Danzo, why did you allow this to happen? How could you allow Danzo to go around with such authority instead of locking him up or killing him and why should I trust you in the first place? You took my life away, you bastard!"
Minato - "Who are you? And you are who's father? Why were Uchiha blamed if it was a Natural Disaster?"
That's all I can think of, but I hope Sasuke does share his outrage, hate, and suffering with them (especially Hiruzen).