S.L.
Check out Cambridge Academy at Park/Midway, across the street from Prestonwood. My son (now starting kindergarten) went there since he was about 3 yrs old. He loved going everyday, the facility is really nice and clean, and the teachers/staff are wonderful. My son went there for over 2 years until we moved out to Sachse in July 2007. Highly recommend them and they are reasonably priced for that area.