I had heard good things about all three of the currently released expansions, Dead Money being the least popular (though not to say it's bad). Old World Blues seemed like the best choice.
Fallout 3 handled DLC well, in that all items could be brought back to the main world. Only Old World Blues in New Vegas allows this, which is strange. OWB also allows haircuts, facial reconstruction, and skill reset. The first two were available in Fallout 3 without additional content, so I always wondered why New Vegas didn't have them.
