ANY production is fine to use.
No matter how small or obscure (if a group of highschool kids put on a production in their middle of nowhere town that no one has ever heard of let alone been to it would be fine to use).
...If you feel you can use the obscure productions effectively, go for it! All the better for you, because you'll probably display more "orginality and flair" (band 6 criteria)
hey, you can even make up your own production. thats what im doing, and i cant gaurentee there wont be another essay like mine in the whole of Australia, cause all my ideas are original and suited to the interpretations that im doing (absurd/conventional.)