My favorite Mexican Restaurant is a little independent place in Sulphur Springs, TX call Los Mochis. It is NOT fancy, but the portions are large, the food is good, and the pricing is excellent. If you are on Galveston Island, Salsa's on the seawall is a nice place, I really like their shrimp fajitas.
I really like breakfast places. My favorite is IHOP, and fortunately, I have a really good one locally. Denny's is my second favorite, but I don't like their pancakes as much, plus they have removed my favorite meal item (meat lover's scramble) from their new menus.
In the Garland/Mesquite area, there's a place called Chan's that I love... It's like a Chinese fast-food restaurant. They have a window into the kitchen so you can watch them cook your food. Huge portions (2 can eat from a single dinner), excellent food, and great prices. I will plan trips when I am passing through the area so I can stop to eat there.
When I want steak, I always cook it myself. There is a small independent grocery store (http://www.skinnerscornerstore.com/meatmarket.htm) in my area with an excellent meat-counter where you can usually count on getting excellent ribeye steaks. I vastly prefer steaks I have grilled myself; I have a horrible time with getting a steak fixed the way I like at steakhouses. (Saltgrass is the best I have ever eaten at though...) I like my steak medium-well, they always fix it medium or medium rare. And if you send it back, all the juices get cooked out and it comes out over-done. Actually, the best-cooked restaurant/steakhouse steak I ever had was from a Texas Roadhouse. Noisy and too much of a bar-type atmosphere, but the food is good...
<edited to add...>Okay... I also like Pappadeaux cajun/seafood as well. It's priced well out of my normal budget, but I have gotten to eat there occasionally. I always get the fried crawdad platter; those and their onion rings are excellent. I had their etoufee once and did not like it; others with me that day said it wasn't very good either, so I think they just had a bad day... I haven't eaten it since though...
In Paris, TX, a place called the Fish Fry; all you can eat catfish, and it is EXCELLENT!
I also have a weakness for Chinese Buffets; I have found a few I like, and a lot I don't. New Hupei in Longview, TX is one I enjoy regularly.