If you're spending 500-600.00, look into VMPS subs--awesome sound, not for the money, just awesome sound--deep, powerful, clarity, no boom, adjustable to any room to get great sound. They will also blend with very fast speakers and be unnoticable in location sound wise. They have more expensive ones also that are even better.
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I would give some consideration to the subwoofer test data in making your decision. Both SVS and HSU are represented.
I'm biased towards SVS -- made in the US.
It appears that the HSU model has some serious distortion issues.