It really depends on the area of town that you want to stay at but for Mexican I reccomend Dona Tere which is at 9908 Beechnut while for Tex-Mex there is Ninfa's on Kirby, or Doneraki or there is even a small but quaint restaurant between Sheppard and Montrose called El Pueblito...there are many choices!
You should also consider Pappasitos. The Pappa's are Houston residents that have built their franchise from the ground up, and they're great people that turn out great eats. The best meal I've ever had is from Pappadeux (their seafood restaurant franchise).
Also, for super-cheap, you-just-gotta-try-it fare, hit up Taco Cabana (tons of locations). It's a quintessential Houston experience - and you simply have to get tortillas (made fresh on site) and queso. Very simple, but crazy good.
They also serve beer and margaritas, which makes the experience that much better :-). Also, get their burracho beans, not the refried (this is important to note) It's ridiculously cheap and an order-at-the-counter kind of place, but it's just something most people have to do while in Houston. I have literally spent thousands of dollars at Taco C in my lifetime!(and, when visiting the family in Houston this Thanksgiving, it was also the first place I went - before I even went to the house on the way home from the airport!).
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