Chipotle's my default healthy-ish fast food option. They make a big deal out of how they source their food, and if you get your burrito bowl-style and leave off the cheese, you can actually avoid blowing through a thousand calories on your lunch break.
This particular location is very close to my apartment, so I go there fairly often. The staff is usually polite and they usually get my order right. That's really all I ask when I go to a chain restaurant, since the food is (or should be) standardized.
Also, Chipotle is leagues ahead of Qdoba, Salsaritas, Moe's, etc. This is an Adam Fact (TM).