San Antonio is interesting. Have only visited. Enjoyed touristy bars on the Riverwalk. But its less than an hour from Austin. And I'm guessing even more affordable.
I used to live and work in San Antonio. Five years ago it was beginning to show signs of a tech scene. Geekdom had been around for a couple of years and acted as the hub of the community. TechStars had a program there (though no more).
I left four years ago for Boulder so I've been watching it grow at a distance. From what I see, deal flow has picked up and Houston Street in downtown has turned into the epicenter, anchored by Geekdom on one end and Codeup on the other.
It's a great place to live and I'm constantly tempted to move back, though I expect that I'd need to find remote work to maintain the pay I currently make up here in Colorado. Excellent food and low cost of living in a city that's rapidly growing up.