Gibson’s Steak House- Great steaks, great service, great bar scene. Definitely a Chicago type place where I generally bring out-of-town guests. It is a very active restaurant, and if you are looking for quiet, you may want to avoid that.
Osteria Via Stato in the Embassy Suites is OK. Ambria is good, but foufy French and pretty quiet.
I recently had a great meal at Spring near Bucktown.
You might want to throw a post up at LTH Forum, where the folks over there have quite a bit of knowledge about Chicago food. Be a little more detailed in your post, and I’m sure you will get a lot of options: