Temple of Doom is the best one because it's the only one I watched a child and the images still haunt me.
Fair enough, but it does have the best chase scene of all times. And chilled monkey brains!Raiders and Last Crusade are, but there's something lacking about Temple of Doom. I'm not saying it's bad or that I don't watch it, but I'm not that arsed about it and it's at the bottom of my list when I decide to rewatch any of them.
Fitting, that the archivist would appreciate this scene.The Ark of the Covenant's surely the best artifact he goes after, even the Holy Grail seems boring by comparison. Raiders has that incredibly tantalising scene at the end with the warehouse full of mystery objects and that haunting theme too.