In my opinion, the best, by far, was Palex. Out of all the couples throughout Degrassi history, they seemed the most realistic and sincere, and captured the sense of "true love." The fact that both girls came from very different backgrounds really added to the surprise and greatness of the plot. Their relationship taught Paige not to worry so much about what others think, and softened Alex's "tough girl" attitude a tad. I really, really hope they get back together in future episodes. ^_^