Woo. The only place I've heard an EP500 was in a room, about 12x12 (maybe). It was... impressive, to say the least.

Frankly, either a Hsu or an EP500 with Axiom speakers would be great, and a massive improvement over any HTIB system. As long as you calibrate the EP500 properly, I don't think it would be an issue, and you might want to go that route if you're looking to the future. But again, Hsu makes some nice subs.

I am the Doctor, and THIS... is my SPOON!