This is so gonna turn into a ME2 thread anyway, so what the heck, I'll start it.
Shepards Paragon speech for during the second part of Tali's trial was pretty awesome. I'm not sure sure if it was the most emotional speech delivered, but it's just so perfectly timed.
You know, Tali quitely begging you not to reveal the truth about her father to save her skin, you completely expecting that this will be another difficult lose-lose decision Mass Effect is famous for... Then I saw the blue option and knew it was gonna be a crowing moment of awesome.
Instead of actually bringing in any evidence for Tali, he wins the trial by scolding the admirals for taking politics into courtroom.
Too bad I haven't managed to get the Renegade speech.