We've been doing some initial looking too. We painstakingly looked at moving into Tanglewood / LB Clayton vs. going the private school route. We ended up punting by buying a house that we'll turn into a rental in a couple years before our first starts school.
It's hard to think spending all that money ($20k/yr!) is worth it for your 5 year old to learn addition, subtraction, spelling, and the water cycle. We also don't want to / in some instances can't send our (Jewish) kids to one of those private schools where you have to sign one of those uber-Christian conservative statements (a "covenant school").
Anywho, we're looking hard at All Saints and Trinity Valley. I'm interested to see what All Saints' move to TAPPS means for the school as a whole. You know how they say you can tell a lot about a person by the company they keep? The same applies to private schools IMO. And All Saints is leaving SPC schools TVS, Country Day, Oakridge, Greenhill, ESD, Cassidy, Cistercian, St. Mark's, St. John's, Hockaday, etc. -- all among the most prestigious academic schools in the region -- for TAPPS schools like Trinity Christian of Cedar Hill, FW Christian, Southwest Christian, Frisco Legacy, the Muslim school in Garland, Grapevine Faith, etc. (which has some great schools but not the elite level of academic schools overall as SPC).
It mostly just frustrates me that FW doesn't have better public schools. Especially as much as property taxes are.