Old Sante Fe is in an old Ruby Tuesday building so it feels very chain like, but the food is great, the service is fast, the menu is extensive, and it's dirt cheap. From sitting down to food is about 10 minutes. The portions are large, but not excruciating (e.g. tons of waste). It's TexMex so who knows what "authentic" means in this context, but it's very tasty. $25 for dinner for two.