Sweeny Todd: A must see or a belly flopper?

Okay, here's the deal. I'm coming to New York City with a school choir. We're supposed to go see Sweeny Todd and some other Broadway Show. Tell me, is it really worth the ticket price? Should I go see the show, or go find a good Starbucks, order myself an iced vanilla latte, sit outside, greet people passing by, and soak up the New York City Culture? Also, if anybody could tell me where I could find a good deal for hotels, I would deeply appreciate it. Thanks- Mister Cellophane