Axiom Home Page Forums General Discussion Home Theater QS4 or QS8? Differences?

I am trying to decide whether to go with the QS4 or QS8 surround speakers. Does anyone know if there is any difference between these 2 speakers other than the woofer size. Would the difference in sound be such a huge difference. Also the receiver I will be running only pushes 110 watts RMS which does not even touch the max for the qs4's which is 200 watts and the qs8' max is 400 watts. I knd of feel like the qs8's would be overkill. Has anyone compared the difference in sound between these two?
Thanks for any help in advance