We looked at over 70 houses in Coppell, Carrollton, Grapevine and then eventually Frisco and a small part of The Colony. We loved Castle Hills and tried hard to find a house in that neighborhood that met our needs, but there were no existing homes or any under construction at the time that worked for us. We had a baby due in 2-3 months. We had an offer on a house in a neighborhood called The Homestead at Carrollton which is about 5-10 years old and has great amenities. It fell through due to an illness in the owners' family. We were having inspections done and in the process, the structural engineer told us that homes in Castle Hills have the worst structural issues of any in the entire country - so that is something to be aware of.
I don't know what your price range is, but if you were looking in Castle Hills then you may also like The Tribute. It is at the end of Lebanon Road near 423 and is about 6 miles from Castle Hills. The address is The Colony, but it is essentially Frisco. The schools are Little Elm ISD which at the elementary level have exemplary ratings. Hackberry Elem. is the current school. The school district has already purchased land in the neighborhood to build a new elementary school which will go under construction within 5 years.