I have a similar setup to what you are thinking about:
M80's front
VP180 Center
6X QS8's
2X SVS Ultra
Denon 4311
Emotiva XPA-3 for the front three.
After discussing this setup with SVS, I finally setup Xover of front three to 60Hz and Xover of surrounds to 80Hz. To me, this sounds pleasing and the SVS meshes very well with the speakers.
I use 40% PS3, 40% movies, 20% music.
I would highly recommend the Denon 4311 for the Audessy setup. My system sounds unbelievable under Audessy.
The QS8's are very capable, I would not have a sub on the QS8's. Audyssy sets the QS8 V3 at a xover of 60Hz, and the QS8 V2 to 80Hz. I override that and standardise them at 80Hz.
Last edited by Tariq; 02/14/12 07:09 AM.