Some suggestions:
Gabriel's in Highwood. Chef Viti is one of the best.
Chef's Station: I second this, and they have a very good tasting menu.
Michael's: A French restaurant in Winnetka with excellent food. Lot's of rich sauces.
Oceanique: A seafood slanted place in Evanston.
Stained Glass: Contemporary Evanston restaurant with features wine flights.