If you're up for venturing over to the Big-D, there's an amazing place called Primos on McKinney Ave. http://www.primosdallas.com
Avg $15/plate. The Margarita's are AWESOME!

There's also this place called Mia's on Lemmon Ave, about 2 miles from Love Field. http://www.miastexmex.com. I ate there last weekend, and it was amazing! It's been voted by Texas Monthly to be one of the top 10 places to eat in Texas.
Avg $15/plate.