Thanks for the input. I spent sometime going manually through some of the forums. The general feelings are the QS8 will allow for more options in placement. Since this may be a concern in the future...this is probably the way to go for me.
As far as, using a actual center in a 6.1 set-up, I know that was an original school of thought. But, with a Lexicon Logic set-up, the use of a center maybe overdoing it considering the "type" of info that is steered towards the center rears. I appreciate the insights to your experience and testing.