I've been pretty happy with my Big Agnes Lost Ranger. I bought it largely due to the reviews of JimF if anyone still remembers him... It's a 15º bag and that temp range for me covers a lot of ground, but I'm a warm sleeper.
Though I don't have the experience of most here, I do prefer down. I just like it. I've yet had a problem with it getting wet. If I get terribly worried about that, I'll tote it in a silnylon dry sack.
