IIn my opinion the best one to learn from is the UCLA v. Georgia Tech round. That UCLA team is the best team I have ever seen.
We watched the plaintiff (UCLA) case in class yesterday, mostly observing their witnesses. I thought it was a great balance--the crying victim/plaintiff (although a little over-the-top), the lay expert/character male nurse, and the spot-on psychiatrist. That performance by the psychiatrist is one of the best experts I've ever seen, and what I tried to base my own performance (as an expert witness) on when I competed.
I think Georgia Tech hung with them on cross, though. It was a great demonstration of what an idealized trial would look like--a passionate, emotional plaintiff, and a calm, collected, precise defense.
Thanks for all the recommendations! I'll be delving into the video archive to pull up some of these performances you've been mentioning.