Mostly the one where Shiro beats down a Zeon mech with his GM's own arm. I love when they do that in robot shows, but 08th MS Team has the best use of it.

As for Kira, I don't mean the aimbot hax or any of his bullshit after that point (where he becomes less a character and more a Mary Sue) so much as that exact instant when he snipes the mech about to shoot the bridge from the sky and then appears in front of his friends. That whole feeling throughout the crew that it was a literal "rise from the grave in a sweet new mech miracle" just felt good to me.