Thanks for your question. Stoney Hollow does have some beautiful homes, doesn't it?
Here is a good website to check out the schools in Stoney Hollow: http://www.greatschools.net.
High School: Williams
Sr. High - PESH - Plano East Sr High
You can look up these schools on that website and it gives you the overall ranking by the parents and students that go to the school, the TAKS test scores, ACT test scores, accountability ranking, cultural diversity, and more information like that. As you probably know, schools are ranked as Exemplary, Recognized, Academically Acceptable or Academically Unacceptable. PESH, for example, is rated Academically Acceptable.
You can extrapolate out the demographics of the area by using the school information. The kids that go to the schools there will comprise a good sampling of the families in the area.
We can send you a free report with all the statistical info. you're requesting, if you'd like. :)
As far as crime in Plano, this is a good spot for research: http://www.city-data.com/city/Plano-Texas.html
In respect to appreciation of the homes, homes that sold in Ph 5 of Stoney Hollow about 4-5 years ago sold at $74 per sq. ft. The homes that sold here last year or this year are selling for an average of $82, so they are going up. :)
Let me know how else we can help.