Phantom Menace is the best one, though Roadhouse is definitely up here. The difference is that the Rifftrax are a lot better when there's multiple people, and Roadhouse is just mike. Three of the newest ones have all three MSTers, and one has Rich "Lowtax" Kyanka from Something Awful (if you've ever browsed their movie reviews, it's Troll 2). Be forwarned, though. After seeing The Phantom Menace with Rifftrax, you will be keenly aware of how utterly horrible the movie is.