Agree about the people. Texans believe that they are better than people from the rest of the world - especially Texans from the DFW area.
Obviously I disagree with the above quote.
Anyways.
To the OP: If it makes you feel better the Dallas Cowboys now reside in Arlington, not Dallas, which is much closer to Fort Worth. I wouldn't put kids into the Dallas school district if you can help it. Seriously - don't. PM me if you want to know why I feel that way. I agree with other posters who've said to look at Plano or Frisco - northern suburbs of Dallas. They both have good school districts.
While Texas (with the exception of Austin) is much more conservative than states such as MA, CA, NJ and NY, I see just as many bumper stickers for Democratic candidates driving around town as I do Republican candidates. I think there's a good mix of political and social beliefs here but overall it is a little more conservative in values than some other states. But as a PP said: no one is going to coerce you to go to church or root for the Cowboys (I'm not a Cowboys fan either) or give you grief if you lean more left in political/social views in a red state. Also, as someone else pointed out: no state income tax. Which is nice.
There is great Mexican food here and HOT summers so take that into consideration before purchasing anything down here. Both ceiling fans and a/c is a must in this state. But while we have heat, the humidity isn't too bad up here. It's not a dry heat like Las Vegas but it's not all that humid like Houston or Orlando, FL. In Texas you could have 80 degree weather on Monday and snow by Friday. - but snow here is only a few inches. Nothing all that serious. But since it doesn't occur often you have to worry about Texas drivers attempting to drive in it.

That's the scary part. All 2 - 3 times/year.
Despite popular belief: we don't ride horses to work and I honestly don't see very many people in "cowboy" stuff (boots, hat, wranglers, ect...) Most people in the Dallas area dress just like the rest of the United States. We have malls, restaurants, ect... same type of stuff you'd find in any large U.S. city. Art museums, theater, botanical gardens and zoos. There are things like that. One stereotype that is true: those massive pick-up trucks. Hate them! They're huge. And they're all over the place. So yes, lots of large trucks and SUV's in this state.