Big area. Lots of great restaurants.
A few of my favorites:
Dallas
Javier's
www.javiers.net (also has a great cigar lounge in the back)
Al Biernat's
www.albiernats.com
The Mansion on Turtle Creek
www.mansiononturtlecreek.com
Fort Worth
Lonesome Dove
www.lonesomedovebistro.com
St. Emilion
www.saint-emilionrestaurant.com
Del Frisco's (also has other locations)
www.delfriscos.com
Arlington
Drive through it