Doberman Pinscher...however, here is what it takes to have happy Dobes:

plenty of attention, plenty of excercise, plenty of affection from you, plenty of training (they are much smarter than most people), plenty of love, plenty of play, plenty of socialization with humans and other pooches. And also plenty of couch and bed space with good TV viewing angles! (I realize I've just described all dogs needs)

Dobermans aren't good in extreme heat and since you are in Tejas bear that in mind.

Dobermans aren't going to attack a stranger and rip them to shreds unless they are trained to just like you could train a chiquaqua to do (just in smaller bites). Of course their mere appearance will put the fear of God into most people. They will treat a stranger exactly as they have been trained to and in the absence of training they will probably sniff, lick, jump on and generally scare the pants off of most people.

Talk to your local Dobe rescue...they will be honest and let you know whether a Doberman is for you.

Good luck!