I do enjoy the concept of Chipotle, but I think it's feeding into America's obesity problem. The portions are just outrageous. I wish they had smaller options.
My suggestion is to get your bowl or burrito and keep the sour cream/guacamole on the side. Eat just half of it -- trust me, you'll feel sick if you devour the whole thing. Then you have another meal for later that you can warm up quickly in the microwave. Otherwise if you put those cold toppings on, they won't be so good after nuking.