There are several nice restaurants near Universal that offers private seating areas for groups of your sizes. Some are actually in the tourist areas, but others are more of upscale local joints:
Timpano's: This is a new restaurant located on Sand Lake Road, just a few miles from Universal. They offer an Italian chop house type theme and is very popular - always busy, and has had rave reviews. They typical cost is about $35 per head and they have private seating area for meetings.
Morton's of Chicago: This is a classic steak house with some of the best meats in town. This is where the local business men go to close deals over a nice peace of meat, glass of scotch on fine cigar. Typical cost is about $50 per head and they too also can arrange private seating areas. This restaurant is also located on Sand Lake Road.
Ming Court: Located on International Drive, adjacent to the Convention Center, they call it "Innovative Oriental Cuisine". They have a beautiful restaurant, with faux painting throughout. They have a dramatic banquet room that can accommodate your group and they cost will be about $30 per head.
Sam Snead Tavern: Is located in MetroWest and is a golf theme restaurant located with a private dining area. The food is good and ambiance is great. They have a lively bar where you will find a fun local crowd. Typical cost will be about $25-35 per head.
There are a few other restaurants that should be considered: Roy's which is unique seafood themed restaurant on Sand lake Road, Ranjetsu which is a Japaneese restaurant on International Drive and Christinis, an award winning Italian restaurant on Sand lake road.