EEK! Not to interrupt the HSU sales pitch, but I heard the SVS 20-39 (not the PC+) and it was anything but boomy.
Since you're in Canada and will get hit by those import duties with the SVS and HSU (what happened to NAFTA?) it seems like the Axiom EP500 is a no-brainer. I've never heard it but it sure seems like a fine piece of equipment.
That's my $.02.