In chicago, I looked at David's Bridal as well, but didn't like their stuff.  I heard Eva's bridal is good (i know two girls who bought their dress there). Payless bridal is okay.  If you are looking for really high end stuff, i went to Priscilla of Boston in OakBrook and they have some really gorgeous dresses, but really pricy. 

I bought my dress in St. Louis.