FOUND IT ... Only the Very Best Authentic Mexican Restaurant.
Right in downtown Palatine, IL Mexico Uno has a great selection of scrumptious and very reasonably priced meals. The special taco meals are the best that I have ever had and I grew up on Mexican food. The chips and flavorful salsa are bottomless and included with every meal. Of course, soda refills are also free.
Scrumptious food, very reasonable prices (~$9 dinners with rice and beans), outstanding, friendly service ... no question why I dine here several times per week.
Great job Mexico Uno ... Upward and onward.
PS. Now all you have to do is offer free wifi. :) Some people are never satisfied.