I live in a very safe area in North San Antonio and the school district has a high rating. I think the one thing that should be considered before moving to San Antonio and choosing your area IS: will where you live put you in a position to commute in unnecessary traffic and thus create stress and waste your disposable time causing you increased gas cost and more time away from your family needs?
For instance, if you work at Toyota on the southside, you wouldn't want to live on the northside. And, if you live on the southside, now you have school district concerns. What I am getting at here is: where you decide to live should be considered carefully in light of your career decision and/or your work location or secondary schooling.
BTW, one thing you might need to know is that some of the outlying areas that are nice/safe are presented by real estate agents as great places to live because you don't have city taxes, which are higher. Ok, but in our area, our taxes are almost just as high because we pay two county taxes: one in Bexar (pronounced "bear") for municipal services AND one in Comal for school attendance (where you have a child in that district or not). Combine them and they almost equal the city and county property taxes PLUS you cannot avoid HOA dues in the outlying areas.
San Antonio area is growing by leaps and bounds, literally. Also, there is a prevalent allergy here for many from what is called "mountain cedar". It will make you miserable for 6-12 weeks a year with the eye symptoms, if you happen to be in an area where it is featured, for lack of a better word!
We would like to sell our house this year after buying new in 2006 at 210k. The allergy has been tough and the taxes higher and the traffic worse than we anticipated.