I'm sure you wrote an incredibly insightful piece here, but I simply could not read past where you called "Heart of Gold" one of Firefly's weakest episodes.
"Heart of Gold" holds a special place in my heart, not only for the seriously steamy Mal sex scene with Nandi (it's nice to know the man got laid at least ONCE in the show and movie's timeline), but for where the incident takes Mal's relationship with Inara. And let's not forget the conversation Wash and Zoe have about having children which is especially heartbreaking in light of the events of the movie. There may have been some silly crap in between about whores and bullies, but overall it was an important and enjoyable episode.
OK, I think I've let off enough steam to return to reading.
As for the perhaps dated message (is valuing yourself every really dated?), the film is a homage to the monster movies of the 50's after all so the message fits well into that design.
I saw the film yesterday in (stereoscopic) 3D and was just blown away by how beautiful it was and how much more immersed in the story it allowed me to be. The scenes inside the alien spacecraft were particular detailed and rich.
So if you can, get yourself to a theatre showing it in 3D!