I like David from "Lawrence of Arabia's Headdress" assembly the best too. Many contestants tried to get all three pieces at once, and they usually fumbled and the dropped the pieces everywhere. But David took all three pieces at once like they were nothing and he didn't he drop a piece at all. And on top of that, he still had a very fast assembly.
Jarrid from "Pirate Captain" had a cool assembly too where he just plopped the pieces of the statue onto the base.