I honestly do not know. I am north of town. I usually go to bicycles plus here in flower mound or Coppell. Any reputable bike shop though will have a few very well educated riders that will be able to help you out. I think there is a bikes Inc. in Irving, not sure about Arlington.
The first thing they aure going to do is put you on a few bikes based on your height. from there they will fine tune your fit with saddle placement and a few other tweeks.
From your visit you should be able to know what size bikes you need to look at.
*Other things to consider. When purchasing a road bike you need to test fit lots of bikes. Every manufacture has a different fit. Some have longer or shorter head tubes, and bar placement is different so everyone will fit differently. Find one that will be comfortable for you. Think long term comfort as well, becuase you could potentially be in the saddle for 2, 3, or more hours and you want it to be as comfortable as possible.
Most shops also do test drives, some will let you give a CC number and take the bike home for a week and try it out. Take advantage of this. This will help you make sure you get the bike that you really want. Spending that much money and having buyers remorse will not encourage you to ride the bike when you get it home.