How about Chevy's Fresh Mex, the venerable Emeryville, CA based chain?
The have a location in Schaumburg, just adjacent to Woodfield Mall. I was at Chevy's only once in my four years as a Californian--for a work colleague's going away lunch. It was wholly unremarkable, but it exhibited a certain Mexican chain je ne sais quoi. Might be right up your alley.
Chevy's Fresh Mex
1180 Plaza Dr.
Schaumburg IL 60173
(847) 413-9100
N.B. Chi-Chi's Wikipedia page,
http://en.wikipedia.org/wiki/Chi-Chi's, is great. It features some details on the Hepatitis A outbreak that led to the chain's demise, as well as some variations on Happy Birthday that the staff would sing.