I have also had a ball with the new movies, but my favourite Star Trek movie would have to be the one with Whoppi Goldberg Star Trek Generations. It blew me away the idea that inside the energy wave you could travel to your favourite moments and live them again, make different choices and experience the outcome. It was my first exposure to this concept without it being immediately disastrous to the person involved (I.e every different decision leading to a worse outcome) Of course, Kirk learned the true nature of his reality and made the choice to leave, but he still got to carry those memories with him.