My husband and I walked away from a happy life and two good jobs to move to a new state. In many, many ways it was a perfect move. In so many ways, though, nothing turned out like we expected. In the end, I think we just transferred one happiness for another. That could just be that my husband, myself and my two sons would be happy anywhere because we're together...it's hard to know.
We thought our move would be a huge financial boon. It wasn't. We thought it would be great for our kids. It was. We hoped the move would allow my workaholic husband more time with family. Yes and no. It did for a while, then it didn't, now it does again.
Bottom line...we're living pretty much the same life for half the cost. We still have financial struggles, my husband still works too much, we still work jobs that we love. But, as I look back over the last 12 years in my adopted state, I know that there was much less stress than if we had stayed in our home state and our quality of life is better.
If moving to Texas will reduce your stress levels and increase your quality of life, I say GO FOR IT! If it doesn't (your sister doesn't sound at all "less stressful") or if you question whether your belief system will mesh with your new community, well, I'd reconsider the move.
All states have economic booms and busts. Keep that in mind. And, the bigger the boom, the bigger the bust. Take, for example, my county (Lyon County, NV). Three to five years ago, we were the 5th fastest growing county in the nation. Now, we are one of the hardest hit counties in one of the hardest hit states in the nation. Our community went from an average per capita income of nearly $50,000 to one with nearly 20% unemployment. I teach high school and I have kids whose families went from gainfully employed to relying on the local food bank faster than one can blink. Economic good times come and economic good times go. Make sure your move doesn't set you up to experience two "bust" times in a row!
Good luck!