The ending of Evangelion episode twenty-six. Better than "End of...". I prefer ambigious endings that accomplish little things, not the bigger picture (which is always resolved ludicrously)
G1 ended twice for me, "Return of Optimus Prime" actually had a firm ending, Galvatron, in one of his better states of mind, shaking Prime's hand (despite his trying to feed him to a giant spider on Charr earlier), once Prime used The Matrix to cleanse the world of the hate plauge. The Matrix's power and wisdom was also dispersed, leaving a new generation, Prime's generation, to fill it.