Although it's not the best food of its type, I really like Reza's lunch/brunch buffet. I think it's a little bigger on the weekends and they charge $19.95 per person.
They have a ton of options and all of them are decent. Salads, apps. kebabs, stews, salmon, lox, shrimp, desserts, drinks, etc. None of it is food to go out of your way for, but if you're looking to please a group at a somewhat reasonable price, I think it's a good option.
North side option is
5255 N. Clark St.
773-561-1898
Best,
Michael / EC