I have heard Questa is a bad play with good actors.
I think Play without Words and The Book of Liz would be safe bets...If you are ready to venture to Orange County, Lucinda Coxon's Vesuvius (world premiere) will be playing - her style is very emotionally and intellectually challenging- not light fare but very rewarding.
"It does what a musical is supposed to do; it takes you to another world. And it gives you a little tune to carry in your head. Something to take you away from the dreary horrors of the real world. A little something for when you're feeling blue. You know?"