For movies I would stick with the QS 8's. They are awesome speakers and do the job of surround duty perfectly. I personally wouldn't use axiom direct firing speakers as surround unless perhaps I was going to be using them for surround music listening only.

I would stick with QS8's all the way around for side and rear surrounds. Some use book shelf speakers for rears depending on how far back they are from the listening area.

I have only tried the QS8's for surrounds though so perhaps someone will chime in who has tried what you are suggesting.

-David