I have also known Rienda's since it was called Riva's. I remember going there my first time with my 4th grade teacher some 15 years ago. The bean and cheese chimichanga's will beat the enchilada style burritos any day.
Not a whole lot of seating, and the place can be a little dingy at times, but the food is great for the price. It's a secret indulgence of mine.