My favorite place to go to is the Country House restaurant in Clarendon Hills for a burger. They have buffalo burgers which are very lean. Here is the link: http://www.burgerone.com/clarendon_hills/
Analog, I agree. Really great burgers there.
BTW, I know the manager there. Friend of a friend. He claims that the restaurant is haunted and that when it's quiet employees hear people walking around in sections of the restaurant that are empty. It's also rumored that you can sometimes see a face peering out of the top front window (facing 55th St.) even when the restaurant is closed. I've never seen one though.