We liked Mama Melrose when we had lunch there one day.
You can book any of the MGM restaurants with the package. We thought the package was a great deal, since you have the reserved seating. We did not have to line up hours before the show, and keep the kids entertained, sitting in their seats.
Since you only have the night for the show, I would recommend doing the package. The only negative is if the show gets cancelled due to weather. You are still stuck with eating at the restaurant you chose.
For the package, they will not actually charge you until you have eaten. Since the whole menu is available to you, they don't know what you have spent, until you have dined.
For our package we did Hollywood and Vine - the buffet. But still based on the drinks we ordered, the bill was not a fixed price.