ABC Seafood. The lobster with ginger is amazing. I do not believe they use MSG - I'm allergic to it and I've never felt sick after eating there. Their broccoli is wonderful - everything (except the dim sum which I don't like anyway) is good. It's on Ord.
Many of the larger restaurants in Chinatown will prepare dishes with no added MSG on request. Check, however, if a particular dish has been prepared in advance with MSG.