Burrito Bandidos has some of the best burritos I've had in the downtown. Being in the Annex, it's a pretty convenient location. The pricing is pretty standard, and the burritos are delicious. It can easily hold its own against some of the bigger chains like Chipotle.
Only downside is that there's barely anywhere to sit down, other than a tight set of chairs near a high table facing the only window. You will most likely be taking the food to go.