At this point would just like a place with decent weather and a not-crazy COL. Mr. krista was heavily in favor of the Pacific NW, but I fear the COL and general dreariness (as opposed to malaise). Open to DC, Austin, Denver and a few other spots but ATL seems a leading contender right now.
If you're seriously considering DC, I would jump in the dedicated thread with any specific questions (neighborhoods, etc..). Bunch of FBGs live in and close (scooby, Tobias, Don Q, DC Thunder, and more) and are a great resource.
As for the area in general, COL will be on the high side compared to places like ATL. The weather is more variable, too - though no more extreme than Chicago. It's extremely diverse, with a large thriving arts/food/cultural scene. From what I'm told, DC has one of the best Metro systems in the country (& is steadily being expanded) which is good because traffic sucks.
For sports, you have the 4 majors plus Baltimore right up the road with the Ravens/Os. The college sports scene is nothing like it is in the south & midwest - much smaller, more diluted (many there are from somewhere else and root for other teams), and more fair-weather.