R.
Lewisville/Coppell area is #8 on the national list of the most affordable suburbs to live in. They weighed all sorts of factors like quality of public schools (Lewisville and Coppell ISD are only a little above average when weighed on a national scale), crime rates, parks and recreation, shopping areas ect...
Here is the Link: http://www.businessweek.com/bwdaily/dnflash/content/nov20...
Also Flower Mound is listed as the 9th fastest growing city in the US. (Link: http://www.city-data.com/top32.html)
Lots of neighboring cities (Grapevine, Lewisville, Coppell) are getting the pros and cons of Flower Mounds growth (including home appriciation and slowly rising crime rates).
If you are only looking for a home to live in for 4 years I would go with the Coppell/ Grapevine/ Lewisville/ Flower Mound area. Even with home sales slowing down the growth in the area will be good for many years and the public schools are rated at average to just above average (nationally).
Usually with good growth you get better private schools as well. A few really nice ones have shown up in Flower Mound over the years (Explorations Academy in Lewisville would be my first choice if I didn't homeschool my daughter- http://www.explorationsprep.com/).
Lastly, More school info:
Here is a link to Standard and Poor's SchoolMatters- Texas site. It will give the rankings of schools in Texas and also compares them nationally.
http://www.schoolmatters.com/app/location/q/stid=44/llid=...
RPocai