Pancho's is a great little mexican restaurant hidden in a little strip mall off of Hoosick Street. You can easily miss it, so look carefully. It is in the strip mall next to the Wal-Mart.
I've never had something that I haven't thoroughly enjoyed. My favorite lunch is the beef chimichanga. The portion-size is perfect - very rarely too much (unless you wanted to get dessert, too...) - but always filling.
If you have left room for dessert, you're in luck. They have a great dessert menu, including several cheesecake varieties and a yummy fried ice-cream.
I can usually get in and out in less than 40 minutes, leave very happy and full, and spend less than $15 including tip...