OK. You asked for it. Opinion:
After looking at the dive destinations of aquarena, flower gardens, keys, carribean and tropical, liveaboard -- I have to tell you, stick with your wet suit. It fits well for those destinations. Don't knock it. A wet suit is pert neart ideal for those situations.
As for travis, a wet suit is very acceptable at travis for at least 6 months of the year. Go with it. It's all good.
If you end up doing any diving that is more aggressive than this, ie. colder, farther north, etc., then maybe a dry suit is acceptable; but honestly, given the price of a dry suit and the frequency of which you might actually get to use a dry suit, I don't think I could recommend the purchase.
One other thing, with 50 hours of dive time, I suppose you are your own individual and can decide if you want a dry suit or not; but I would recommend you get a few more dives on a wet suit before venturing into the interesting escapades of diving in a dry suit.
Two last points. For a wet suit, I find that a 5 mil multi-purpose wet suit works very well for me in most all situations except for the coldest months of winter or the most extreme of conditions. A 5 mil wet suit is very versatile and it's much cheaper than a dry suit. I personally believe that a 3 mil suit is too thin for most Texas diving.
Lastly, it is my opinion that a 5 mil wet suit is your best fit for your current dive experience and diving requirements. These things will change in time. One year from now, you will probably need a dry suit; just not right now.
These are just my opinions. I hope they help in some way.