I agree with those that favor a low ES. It's nice knowing that your collectible is actually a collectible. These are too expensive, in my opinion, to be common, mass produce items.
I'm wondering if the other three turtles will have 500 ES for the EX, or if they'll have a higher ES, and balance out the numbers with regulars. I.e. Having more regular Leonardo's than regular versions of the other turtles. I would be happy with an ES of 500 for each, but with how quickly this waitlisted I would expect that the rest will go even more quickly as more scalpers try to take advantage.