Rest easy, you're in for a treat.

1) KEEP THE HSU! I have the VTF-2 paired with my Axioms (as do many, many others) and it's perfect.

2) The Axiom QS8's (sorry I've never heard the QS4's) are by far the best surround speakers I've ever heard. I hear more surround effects than ever before, and ambient sounds are so much more immersive. It's really like "being there". I've played back multi-channel music with them as well, and they simply rock.