Are you single, married, married w/ kids? Where to live's going to vary greatly depending on your criteria. We lived in Allen for 7 years, 1999-2006, and I think of it more as family-centric. Dallas traffic sucks, I've been in more congested traffic (San Jose, northeast), but never such rude traffic, so try to live close to where you are going to hang out the most is my advice. We lived in Austin for a year 2006-2007 and moved back to be near family, we live in Mckinney now. I've lived in Richardson and Plano also. My husband grew up in Garland (it's changed a lot since then, though). To be honest, I'd take Austin over any place in the DFW area (we lived in Austin for a year), but my family isn't budging and I want to be close to them while the kids are too small to travel back and forth well.
hypostomus is right, women here can be a little stuck-up, especially the good-looking ones. I'd honestly recommend internet dating sites or churches for meeting women, most of my male single friends (some are now married!) seemed to have the best luck that way. One friend did meet his future wife at a Friends of the Opera event.
Also, what are you into as far as hobbies? That should probably be factored in when you look at where to live, too. The White Rock Lake area has a lot of cyclists and runners. In Plano, the main forms of entertainment seem to be eating out and going to the movies.