Well, Munton's and Coopers kits are junk in my opinion. They don't make a quality product, and may be barely drinkable.
Cervasa and American Lights are lagers. They require cold fermentation, long periods of cold storage, etc, and are among the most difficult brews even for experienced brewers. The "kits" that call themselves by Cervesa and American Light kinda lie to new brewers- making you think you'll make something like that. You cannot. Not without a lager yeast and specialized techniques.
That's why I suggested a cream ale. They are pretty easy, and with a good quality dry yeast like nottingham in a cool basement or room (can you do that in Texas?), you can get a very good beer. The key for any brew is to keep fermentation temperatures UNDER 70 degrees. Not many beers can taste good if the temperature gets above 70 degrees.
But if you can maintain a temperature under 70 degrees, this kit:
http://www.austinhomebrew.com/produ...d=356&osCsid=e5a5e40d40af2ff8525158e9ee76032b with the "extract" version would be great!