I thought the notion that the FMA universe was a
mirror of our world, where physics is superseded by alchemy was a cool plot-point exclusive to the first series. I'd recommend watching the movie. It kind of expands on and smoothly (ish) rounds off what we see occur at the end of the anime-specific story.
I think it'd give you a bit more closure before going on to the (more manga-faithful) 'true route' of Brotherhood.
Amnesia is great and I am absolutely smitten with Yumi Hara's voice, but, considering I watched it fairly recently, I voted 'No' on it and probably won't be watching it along with you guys, but it's fresh enough in my head that I'm sure I'll be able to get involved with the discussion here and there.
Oh, Yuuko. You're so
lovely...
(Dammit! Now I've got the OP stuck in my head! Dx)