Remove that stance bar! RAWR
It's a super nice UI but I bet those WeakAuras (not sure is WA or an actionbar directly below your character) would get lost in a raid environment :P
I had never actually thought of this 'moving actionbar' business; it's a nice idea
Although considering that I only use one actionbar which is just for spell cooldown management, it would probably be unnecessary for me to put more effort into making it move around my screen hehe
Your UI looks like it gets the job done though