Truthbetold,
http://www.bestplaces.net/zip-code/Reston_VA-72019000031.aspx
http://www.bestplaces.net/zip-code/Reston_VA-72019100031.aspx
http://www.bestplaces.net/zip-code/Herndon_VA-72017100031.aspx
I am try to locate the information you asked as far as housing values in Reston VS. 20171 Oak Hill homes. I assumed 20191 and 20190 for Reston, but not sure if there are others that feed to SL currently. I also cannot determine how accurate this web site is, but it does seem to be pretty up to date.
As far as all of the folks moving into Reston, I believe it. There are great jobs, shopping etc in Reston.
What is difficult to determine, is where all of the high school aged kids are going, since it looks like one the kids reach about 14 and up, the percentages drop pretty signifiacntly.
Here is a link to age and populations stats on Reston
http://www.bestplaces.net/city/Reston_VA-55166672011.aspx
People Reston, VA United States
Population 59,774 293,655,400
Pop. Density 3479. 4 80
Pop. Change 5.97% 5.88%
Median Age 39.3 37.6
Households 24,809 108,954,329
Household Size 2.39 2.6
Male Population 49.30% 48.65%
Female Population 50.70% 51.35%
Married Population 58.51% 58.89%
Single Population 41.49% 41.11%
ESTIMATED TOTAL POPULATION BY AGE
Age 0 to 4 6.88% 6.74%
Age 5 to 9 6.82% 6.73%
Age 10 to 14 6.08% 7 .10%
Age 15 to 17 3.75% 4.32%
Age 18 to 20 2.40% 4.37%
Age 21 to 24 3.56% 5.53%
Age 25 to 34 13.74% 13.47%
Age 35 to 44 17.71% 14.86%
Age 45 to 49 8.01% 7.51%
Age 50 to 54 8.26% 6.73%
Age 55 to 59 8.10% 5.66%
Age 60 to 64 5.69% 4.44%
Age 65 to 74 5.49% 6.45%
Age 75 to 84 2.42% 4.41%
Age 85 and over 1.09% 1.70%