1: Oklahoma. For me this is a must see. The cast is phenomenal, and not just the leads. In many ways the supporting cast is even better and more compelling. It's probably the first show that I wanted to see again immediately after curtain. It's closing in January so fit this one in
2: To Kill a Mockingbird. The cast is changing out so who know how it will change, but the show is superbly well done. And the new cast are no scrubs so you can still expect high caliber performances. It is going on tour so you may have more opportunities to see the show itself if that's all you need.
3: The Inheritance. So, I haven't see this one, but the buzz has me very interested. But it's two parts so that would eat two slots which makes is a bit of a sacrifice to see.
4: Mean Girls. You've seen it already, see something new. There are so many great shows, why sit through this again? Unless you liked it, in which case... I mean, that's cool, we've all got different taste. :)