Completely subjective question that is bound to get many different answers from both locals (who are more likely to reference hole-in-the-wall spots) and past visitors (who tend to reference chains) but here are a few of my favorites (chain or otherwise):

* Best nachos, best guacamole, best salsa - Anamia's (three locations in the northern suburbs)

* Best enchilada dinner on special - El Fenix (and their chips/salsa are great too)

* Best brunch spot (which would mean migas for me) - Blue Goose (preferably on the patio at the original on Greenville Avenue where you can watch the world go by)

* Best margaritas in a dive-y place - Esparzas (in Grapevine - in the summer you can sit out on the front lawn in a plastic lawn chair and mingle in the scene which includes a LOT of pilots/FAs)

* Best margaritas in a nicer place - Mi Cocina (many locations) - The Mambo Taxi - two will get you sauced, three will knock you on your arse

* Best margaritas in an upscale place - Via Real (by the Four Seasons Las Colinas) - good local people watching and nice strong $18 margaritas

* Best mariscos - La Calle Doce in Oak Cliff - don't go alone after dark

* Best tacos - if you aren't brave enough to hit the small taco vans that are around, hit one of the Deep Ellum joints for some good stuff (I like Sol's Taco Lounge) before you see a band

* Best healthy for you queso served by Dallas' best known transexual - Monicas Aca y Alla (the photo of her peeing standing up is no longer in the men's room, but the fun times remain - you can eat your goat cheese queso with no guilt and feel free to jump in if a conga line springs up out of the blue)

* Best alterna-chips - Blue Mesa (fried plantains are mixed in with the tortilla chips for some hearty eats)

* Best "not on the menu" Tex Mex - the Bob Armstrong dip at Matts

* Best take the out-of-towners there spot - Joe T. Garcia's in Fort Worth (why this place stays popular is beyond me, but everyone always wants to go there when they visit!)

* Best "if the police dine there, it must be good" spot - Fiesta on Hemphill in Fort Worth (been going there since I was a kid and its got the best family sized portions around)

* Best "local spots"- Danals (owned by the same family that owns the supermercados of the same name, this is about as good as authentic gets)

* Best "good things come out of Lubbock" spot, part I - Abuelos (but order the las mejores de la casa - and with spinach and potatos instead of beans/rice - for the REALLY good stuff)

* Best "good things come out of Lubbock" spot, part II - Don Pablos (yes, its a chain, but its good when you have the "only eat at chains" folks in tow)

* Best "see and be seen" Mexican - Primos on McKinney, natch

* Best place to spot Elvis, or at least pick up a date trying - Chuys (corner of Knox/McKinney)

* Best "not true Tex-Mex, but a great joint nonetheless with really cheap beer and a cool scene" - Fuzzys Taco Shop on Berry St. (across from TCU) in Fort Worth