Where you should go depends a lot on who will accept you and what you can afford.
Probably the best thing to do is recognize how philosophy departments differ, and decide what it is that interests you.
Most American universities tend to distinguish between Analytic and Continental philosophy. The former tends towards logic and computational linguistics, and the best professors will be doing research related to AI and/or cognitive science. The latter tends towards more purely academic subjects, and will give you a more thorough and in-depth introduction to the history of Western philosophy (Ancient Greece, Medieval philosophy, Modern Philosophy, German Idealism, Phenomenology, Existentialism, Deconstructionism, and Pragmatism, to name some of the most common themes.)
Basically, pick whichever aspect of philosophy interests you, and choose the best school you can get into and afford.
I must warn you, however, that if you are just going to study Continental philosophy, a degree in philosophy will not help you. That is, unless you want to go on to teach philosophy, or you want to go to law school. The degree will give you a lot of things to think about, and you will learn some nifty and impressive intellectual tricks. However, when all is said and done, the degree won’t amount to much. You’ll eventually realize that you didn’t need to go to school to learn what you were taught, and you’ll resent the fact that you wasted your time and now can’t get a good job. This could be one of those rare times that I’m wrong, of course.
edit: oh, and since you’re a TX resident, UT Austin is a great idea. It’s the best you’ll get for your dollar. The only problem is that it’s a huge school. The largest in the nation, I think. Austin has a lot to offer. I live there, as a matter of fact–though I’m currently out of state for the year. (Actually, now that I think of it, I don’t miss Austin at all, and I’m not really looking forward to going back . . . not that this is relevant to your predicament, of course.)