If you want something other that the formula menu at a restaurant chain outlet-----
Galleria Area: "Chamberlains Steak and Chop House" at 5330 Belt Line. or "Chamberlains Fishmarket Grill" at 4525 Belt Line are both outstanding.
http://www.chamberlainsseafood.com/
http://www.chamberlainsseafood.com/
Just a few blocks east of the west end marketplace area is "Stephen Pyles" at 1807 Ross, which offers a unique menu. If you are into steaks, the Cowboy Ribeye is a phenominal experience. They also have a unique item on the desert menu called a Heaven and Hell Cake.
http://www.stephanpyles.com/
Dallas has a fantastic group of innovative chefs.