Me personally I go to Saint and Sinners in the Bishop Arts District. I usually see Ejay, but everyone's work I have seen there is pretty reputable.
They usually charge per hour I believe $150 per hour, unfortunately I couldn't find a website address but their contact information is below:
408 W Davis St
Dallas, TX 75208
(214) 946-1330
Now there is another place that I have visited but have yet to recieve any work there and that is Obscurities off of Cedar Springs. The shop is really clean and everyone I have spoke to briefly is very knowledgeable and professional.
http://www.obscurities.com/