I love Federico's on 32nd. Easy jump from Scottsdale open 24 hours a day.
I usually stick to the steak, egg, and cheese Burrito. It's is large and under $5. The drive thru is quick except for lunch time and 2 A.M.
The Enchiladas and Tacos are great and the combo plate is a lot of food. The rice is good but the beans leave something to be desired, I like a creamy refried bean myself. These are not that good.