I don't really have a lot to add to this topic but my dad did live in Dallas for a few years so I just thought I'd throw in my opinion. He lived in Highland Park, which is a GORGEOUS neighborhood, and he lived in a really pretty house that I loved going to stay at b/c it had all sorts of cool rooms and furniture plus a beautiful swimming pool and guest house. I usually went to see him in the winter or spring though so the weather was never very hot.
I hated going to the malls there though b/c I felt like I wasn't pretty enough or dressed right, but then again I never lived there so my perceptions were probably totally off!
However, I think it could be fun to live there if you like the fast paced living enviornment. There is SO much to do there and so much yummy food there!
Good luck with the desicion!