Mix 1/2 cup of the Marinade, cilantro, tequila and oregano in small bowl. Place steak in large resealable plastic bag or glass dish. Add marinade mixture; turn to coat well. Refrigerate 30 minutes or longer for best flavor.
Meanwhile, for the Avocado Chopped Salad, place all ingredients in medium bowl; toss gently. Cover. Refrigerate until ready to serve. Remove steak from marinade. Discard any remaining marinade.
Grill steak over medium-high heat 4 minutes per side or until desired doneness, brushing with remaining 1/4 cup Marinade halfway through cooking. Discard any remaining Marinade. Let steak stand 5 minutes before slicing. Serve steak with Avocado Chopped Salad.