1. Star Trek (2009). Not only is it the best opening of the 11 films, it's also one of the absolute best scenes from any of the films. The birth of James Kirk coinciding with the death of George Kirk is absolutely epic. Plus, you have the all-too-brief general baddassery of Captain Robau.
2. Star Trek: Generations. Again, it may be the best scene of the film. While I'm a big fan of the Next Generation cast, I felt like this film clearly demonstrated that Kirk "still got it" and could have kept doing these movies for a few more years yet.
3. Star Trek VI: The Undiscovered Country. I love the way the tension builds as the shock wave begins to hit the Excelsior. The vibrating teacup is a great image. I love Captain Sulu's very basic reaction to the image of the shockwave heading for the ship. "My god. Shields. Shields!" Also:
"'An incident'?!"
"Do we report this, sir?"
"Are you kidding?"
Like the rest of this film, Meyer crafted a scene with style up the ying-yang.
4. Star Trek: First Contact. I love the very impressionistic style they used to recap "The Best of Both Worlds."
5. Star Trek II: The Wrath of Khan. Way to throw the spoiler whores off the scent by giving Spock that early fake-out death. I also love the exchange between Kirk & Bones:
"Physician heal thyself."
"That's all you have to say? What about my performance?"
"I'm not a drama critic."
(I just had a thought. What if Kirk had used the opportunity to turn McCoy's catchphrase back around on him? "I'm an admiral, not a drama critic.")
6. Star Trek: The Motion Picture. I'm generally not a huge fan of this movie but they do succeed in making space seem very alien & dangerous. Plus, Jerry Goldsmith's Klingon theme is classic.