What's the best western movie regarding the shootout in Tombstone AZ that's still historically accurate?

Lately I've become infatuated with the whole situation and the characters regarding the famous shootout by the OK corral in Tombstone. I know there are a number of movie adaptations of what happened, and I've been told that they have a varying degree of historical accuracy.

I'd love to watch a good one that made some effort to follow what actually happened based on the court proceedings and other such evidence that we still have.

Any suggestions?