I'm thinking you didn't mention a specific area, just someplace you'd feel comfortable with a gaggle of kids, diversity, decent jobs and under $400k.
SE PA is probably your best bet on the diversity. Nobody gives a cr@p (and actually you wouldn't be that "special"), around here. I think it has something to do with the Quaker foundation. We have two gay couples on our block, and from what they tell me, they've always felt comfortable here (near Philly). Now in our town, you only get lots...not acreage.
Around here, you'd be able to focus on school quality, I think.
Here's an idea for under $400k.
You could add on to this place...it's actually a good bit of land for the area. Excellent schools:
http://tinyurl.com/23etg7
That'll give you an idea of zip codes to search with good schools and open minds.
Good luck.