Personally, I'm going with Speed. I was never a big fan of any of The MAtrix movies. The first I've seen a couple times. Reloaded I saw once, and from that one viewing, I decided to skip Revolutions. It has some good special effects, and the principle cast turned in some really good performances, especially Larry Fishburne and Joey Pants. The script is decent, if confusing.
But Speed is pretty much, like it's been said, Die HArd on a bus. And I mean that because it was pretty much the most original and badass actioner of the 90's. To correct Shocky, the bus can't go under 55 miles and hour (and if I'm wroing and Shocky's right, then Shocky feel free to stamp me an ASS). It's a very original concept IMO, and everything just clicks. The screenplay isn't Shakespeare, but it gets the job done. Keanu is about as tolerable as he's ever going to get, and we get introduced to the beautiful and tal- beautiful Sandra Bullock. Jeff Daniels also turns in one of his patented superb supporting roles, and OF COURSE, we have the great Dennis Hopper as one badass motherfucking psycho. This movie is a Must See for any fan of action movies. For me, it's RIGHT there with T2: Judgement Day.