There is a buffet next to the Olive Garden at SW 74th & Penn (there's a thread about it here somewhere) and although it's a mixed Mexican/Chinese/American buffett, there are always at least a couple of really good Mexican dishes, generally a mole and some sort of pork verde-like dish.
If you want really good tacos and burritos, try Tacos San Pedro on SW 44th, just west of Penn. I've been eating there for 11 years and have never been disappointed.
If you are wanting generic Tex-Mex, I haven't seen a lot of difference between all the ones I've tried. It's all pretty good to me but none really stand out.
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