I'd use a bit from"The Galileo Seven" for Scotty. Suggesting the phasers for power or moreso doing the actual repair. Plus I like the comments he makes when Spock fires the boosters.
And while I would say the saber scene with Sulu and I think Takei even picks that as a favorite, to me it doesn't show who the character really is. I think you need something while he at the helm, which unfortunately, was most of his screen time.
Maybe this from "Star Trek: The Corbomite Maneuver (#1.10)" (1966)
Lieutenant Dave Bailey: Raising my voice back there doesn't mean I was scared or couldn't do my job, it means I happen to have a human thing called an adrenalin gland.
Mr. Spock: That sounds most inconvenient, however. Have you considered having it removed?
Lieutenant Dave Bailey: [sees Sulu quietly laughing at him] Very funny.
Sulu: Try and cross brains with Spock, he'll cut you to pieces every time.
Sulu: Four minutes, thirty seconds.
Scott: You have an annoying fascination for time pieces, Mr. Sulu.
Sulu: If, eh, anyone's interested... 30 seconds.