I live in Kingwood, TX, which is a NE suburb of Houston. It is really pretty (lots of big trees), has 75 miles of wooded hike and bike trails, is a 30-40 minute drive to downtown Houston, is very conservative and Christian and has a HUGE homeschool population. The biggest local Homeschool group has over 500 families in it.
Cons – Oh my gosh it is HOT and HUMID! I am a native Houstonian and I still am shocked every summer at how sauna-like it is here. On the flip side, it is usually quite nice from late Oct to April. Also, if you have allergies, it is really bad place to be. Oh, and we have had a major flood each of the past 3 years, so there’s that too.
Austin is commonly thought of (by Houstonians at least) as being more liberal in general, though I’m sure you can still easily find conservative Christian groups. Dallas is more conservative, but has always seemed to be to be more materialistic (again my Houstonian bias).