I'm looking at replacing my Polk Audio RTi4 (used for rear surrounds in my 5.1) and am looking at getting the QS8 v2 speaker. As well, I'm considering upgrading my centre channel, Polk CSi3. Any comments on comparison between the two rears? Any user comments on the Axiom centre channels? (the vp150 v2 in particular). I realize the possible timbre matching issues with my mains, but would like to know what people think of axioms centers anyways)