Welcome to the Forum >>>>......................
Several members from Texas here , I'm sure you'll get a reply.
LRGV looks to be a good location for an FTA system , I haven't seen any issues with Footprints , maybe a few satellites that have higher strength in Midwest of U.S. may be a little weaker for you , My favorite dish size for the Money is the 90cm Fortec Dish , you can look at some of the sponsors here for good deals , I've used Sadoun for most of my FTA needs.
Other than that , I think most of the continental U.S. has advantages of living in certain areas , I think you will be fine where you are at , in fact there are some advantages of South Texas , one footprint covers Mexico and greater portions of Texas , I can't get them, though it may be for C-band , I can't remember now but I know the programming is in Spanish.