The best in the area is Robert Duhon at Texas Pistol Academy.
He has a web site for info. http://www.texaspistol.com/
He has a nice facility about 30 min north of Dallas... and he is an excellent instructor as well.
His prices are reasonable too.
Give him a try... I have taken several courses from him and have not been disappointed... and I have been to most of the major schools and a lot of little ones too.