Ringling has two shows that travel around, known as the red and the blue ones, this one in New York is the blue team this year, the 134 edition. I know that's not what you asked.
David Larible is the main clown in the 134th, and I personally believe that he is one of the funniest people on the planet. While I haven't seen this show (at least not yet), if it's like past years, he alone is worth the trip, even if he only has two or three appearences.
This one also has the guy who runs around the orbiting rings, another great act. I love the circus (can you tell), and given the choice of the two shows touring right now this would easily be the one I would choose.
There is an offer for 10% off at their website, ringling.com but not sure if it's for a performance you are going to.
If you haven't seen David, then you have to go see him once.