ADVICE NEEDED! What to choose?

I came on this site hoping that someone could help me choose which show to see when I'm in New York next month. I love musicals, but my husband wants to see a play. I decided to get tickets to "Little Shop..." for Friday night, but need to choose a show for Saturday night. Options are:
Twentieth Century
Sly Fox
Avenue Q
I love you...now change

Am I missing anything that is a MUST SEE? In particular, any plays that are wonderful right now? It doesn't HAVE to be on Broadway...off Broadway is fine, too. I just want to see something that my theatre neutral husband will enjoy.

Many thanks for your help!!!!