(lol) L., darlin', I apologize for being blunt, but this is Coppell, the home of upper-middle-class pretentiousness. :-) There is only minimal diversity here (assuming you mean racially or culturally). On the other hand, there are also no bad neighborhoods that I've ever heard of, only expensive and more expensive. And the parks are great and the schools are great, and my husband and I have loved living here for its convenience and quietness and relative safety for almost three years.
In short, I think if you can afford Coppell (less house, less land for the money), you really can't go wrong anywhere in Coppell. (Don't mean to sound pretentious myself -- we aren't rich and live in a very modest neighborhood.)
If you have any questions, please ask!
J.