I've been planning on watching FMA Brotherhood, but I've yet to get around to it.
I highly suggest that you watch FMA Brotherhood. It's a major improvement over the original one, and re storyline used for it actually goes along better than the one used for the first FMA. I can still see some faint contradictions in the plot (I don't know why. When I watched it, somewhere in my brain I thought "wait, this seems a bit odd"). But at least now, te ending is wrapped up in a way where the viewers want to see more, but they don't feel ripped off (which is how i felt when I viewed the first season/original)