I like Barbacoa!! (cow head, including tongue) wrapp it up in a corn tortilla with some fresh pico!! never cooked it myself, may try it one of these days, when ive seen it cooked it is wrapped in heavy foil and cooked in ground just like cabrito (goat) which is good also.
(edit) oh yea for on topic. I use skirt steak for fajitas. got a rub out of steve reichman sp? (i think thats his name) BBQ Bible that was pretty good on fajitas. but yes in Texas its skirt steak onions and bell peppers. we usually make refried beans and pico with em.
God Bless Texas!!!