I enjoy the east coast style Italian Food at Basilico. It's a fairly informal place located not too far from the Arena. Entrees there are a very reasonable $12-$25.
http://www.basilico.net/menu/layout?id=3
If you're looking for something a bit higher end, both Morton's and Gibson's have restaurants located just off River Road. Both are highly recommended for a celebratory dinner though you can easily spend $100 ++ per person in each of those places. Gibson's is my preference of the two. Each place serves an ala carte menu with steaks running $25-$80 and sides being priced at $5-$9.
http://www.gibsonssteakhouse.com/
http://www.mortons.com/
Gianotti's Steakhouse is another Italian Steakhouse just off River Road specializing in steaks and red sauce Italian. It's good. But, from a price perspective the cost is similar to that of Gibsons which, in my opinion, is far superior.
http://www.vicgiannotti.com/
There is also an outpost of Harry Caray's in the Holiday Inn at Higgins and Mannheim. I have not had anything more than bar snacks there, so i cannot attest to the quality of dinner there.
http://www.harrycarays.com/restaurants_rosemont.html
Finally, the Rosewood is the kind of place I'd take my folks if they were visiting from out of town. It has a country club type, dark paneled dining room, and a menu featuring a nice variety of American steaks, chicken and seafood. Their seared tuna is one terrific dish that could hold it's own at ant restaurant in Chicago. The Rosewood is located on Higgins near River Road.
http://www.rosewoodrestaurant.com/
As an aside, I really do warn against the Rosemont location of Carlucci. I've just had too many sub-par meals there to ever endorse it to anyone.
Congratulations of your big day. Hopefully, this will give you a good, diverse beginnning to find a nice place for dinner for you and your family.