Got to have Undiscovered Country near the top IMO. Top 5 for me. 1.Wrath of Khan-Easy choice but the right one 2.Undiscovered Country-Close 2nd for me. Loved Christopher Plummer's performance in the film one of my favourite Star Trek Villains. Great ending the Original Series. 3.Voyage Home-Just a lot of fun. 4.First Contact- Only good TNG movie 5.Search for Spock- Some slow parts in there but overall a solid entry Worst are the new Trek films which are Trek in name only.